Crystal Reports helper class

// -----------------------------------------------------------------------------------------
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR
// FITNESS FOR A PARTICULAR PURPOSE.
// -----------------------------------------------------------------------------------------

// ===============================================================================
// This code is based on the Microsoft Applciation Building Block, see also below.
// Release History
// VERSION	DESCRIPTION
//   2.1	UpdateDataSet always accepted all changes but only submitted one
//			table at a time. It now only accepts the changes for the table it
//			is handling.

#region Original header
// ===============================================================================
// Microsoft Data Access Application Block for .NET
// http://msdn.microsoft.com/library/en-us/dnbda/html/daab-rm.asp
//
// SQLHelper.cs
//
// This file contains the implementations of the SqlHelper and SqlHelperParameterCache
// classes.
//
// For more information see the Data Access Application Block Implementation Overview. 
// ===============================================================================
// Release history
// VERSION	DESCRIPTION
//   2.0	Added support for FillDataset, UpdateDataset and "Param" helper methods
//
// ===============================================================================
// Copyright (C) 2000-2001 Microsoft Corporation
// All rights reserved.
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR
// FITNESS FOR A PARTICULAR PURPOSE.
// ==============================================================================
#endregion

using System;
using System.Data;
using System.Xml;
using System.Data.SqlClient;
using System.Collections;

namespace TestCrystal
{
	/// <author>MicroSoft</author>
	/// <summary>
	/// The SqlHelper class is intended to encapsulate high performance, scalable best practices for 
	/// common uses of SqlClient
	/// </summary>
	public sealed class SqlHelper
	{
		#region private utility methods & constructors

		// Since this class provides only static methods, make the default constructor private to prevent 
		// instances from being created with "new SqlHelper()"
		private SqlHelper() {}

		/// <summary>
		/// This method is used to attach array of SqlParameters to a SqlCommand.
		/// 
		/// This method will assign a value of DbNull to any parameter with a direction of
		/// InputOutput and a value of null.  
		/// 
		/// This behavior will prevent default values from being used, but
		/// this will be the less common case than an intended pure output parameter (derived as InputOutput)
		/// where the user provided no input value.
		/// </summary>
		/// <param name="command">The command to which the parameters will be added</param>
		/// <param name="commandParameters">An array of SqlParameters to be added to command</param>
		private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)
		{
			if( command == null ) throw new ArgumentNullException( "command" );
			if( commandParameters != null )
			{
				foreach (SqlParameter p in commandParameters)
				{
					if( p != null )
					{
						// Check for derived output value with no value assigned
						if ( ( p.Direction == ParameterDirection.InputOutput || 
							p.Direction == ParameterDirection.Input ) && 
							(p.Value == null))
						{
							p.Value = DBNull.Value;
						}
						command.Parameters.Add(p);
					}
				}
			}
		}

		/// <summary>
		/// This method assigns dataRow column values to an array of SqlParameters
		/// </summary>
		/// <param name="commandParameters">Array of SqlParameters to be assigned values</param>
		/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values</param>
		private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow)
		{
			if ((commandParameters == null) || (dataRow == null)) 
			{
				// Do nothing if we get no data
				return;
			}

			int i = 0;
			// Set the parameters values
			foreach(SqlParameter commandParameter in commandParameters)
			{
				// Check the parameter name
				if( commandParameter.ParameterName == null || 
					commandParameter.ParameterName.Length <= 1 )
					throw new Exception( 
						string.Format( 
						"Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.", 
						i, commandParameter.ParameterName ) );
				if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)
					commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];
				i++;
			}
		}

		/// <summary>
		/// This method assigns an array of values to an array of SqlParameters
		/// </summary>
		/// <param name="commandParameters">Array of SqlParameters to be assigned values</param>
		/// <param name="parameterValues">Array of objects holding the values to be assigned</param>
		private static void AssignParameterValues(SqlParameter[] commandParameters, object[] parameterValues)
		{
			if ((commandParameters == null) || (parameterValues == null)) 
			{
				// Do nothing if we get no data
				return;
			}

			// We must have the same number of values as we pave parameters to put them in
			if (commandParameters.Length != parameterValues.Length)
			{
				throw new ArgumentException("Parameter count does not match Parameter Value count.");
			}

			// Iterate through the SqlParameters, assigning the values from the corresponding position in the 
			// value array
			for (int i = 0, j = commandParameters.Length; i < j; i++)
			{
				// If the current array value derives from IDbDataParameter, then assign its Value property
				if (parameterValues[i] is IDbDataParameter)
				{
					IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];
					if( paramInstance.Value == null )
					{
						commandParameters[i].Value = DBNull.Value; 
					}
					else
					{
						commandParameters[i].Value = paramInstance.Value;
					}
				}
				else if (parameterValues[i] == null)
				{
					commandParameters[i].Value = DBNull.Value;
				}
				else
				{
					commandParameters[i].Value = parameterValues[i];
				}
			}
		}

		/// <summary>
		/// This method opens (if necessary) and assigns a connection, transaction, command type and parameters 
		/// to the provided command
		/// </summary>
		/// <param name="command">The SqlCommand to be prepared</param>
		/// <param name="connection">A valid SqlConnection, on which to execute this command</param>
		/// <param name="transaction">A valid SqlTransaction, or 'null'</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>
		/// <param name="mustCloseConnection"><c>true</c> if the connection was opened by the method, otherwose is false.</param>
		private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection )
		{
			if( command == null ) throw new ArgumentNullException( "command" );
			if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );

			// If the provided connection is not open, we will open it
			if (connection.State != ConnectionState.Open)
			{
				mustCloseConnection = true;
				connection.Open();
			}
			else
			{
				mustCloseConnection = false;
			}

			// Associate the connection with the command
			command.Connection = connection;

			// Set the command text (stored procedure name or SQL statement)
			command.CommandText = commandText;

			// If we were provided a transaction, assign it
			if (transaction != null)
			{
				if( transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
				command.Transaction = transaction;
			}

			// Set the command type
			command.CommandType = commandType;

			// Attach the command parameters if they are provided
			if (commandParameters != null)
			{
				AttachParameters(command, commandParameters);
			}
			return;
		}

		#endregion private utility methods & constructors

		#region ExecuteNonQuery

		/// <summary>
		/// Execute a SqlCommand (that returns no resultset and takes no parameters) against the database specified in 
		/// the connection string
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <returns>An int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
		{
			// Pass through the call providing null for the set of SqlParameters
			return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null);
		}

		/// <summary>
		/// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string 
		/// using the provided parameters
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>An int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );

			// Create & open a SqlConnection, and dispose of it after we are done
			using (SqlConnection connection = new SqlConnection(connectionString))
			{
				connection.Open();

				// Call the overload that takes a connection in place of the connection string
				return ExecuteNonQuery(connection, commandType, commandText, commandParameters);
			}
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in 
		/// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="spName">The name of the stored prcedure</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>An int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

				// Assign the provided values to these parameters based on parameter order
				AssignParameterValues(commandParameters, parameterValues);

				// Call the overload that takes an array of SqlParameters
				return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlConnection. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <returns>An int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)
		{
			// Pass through the call providing null for the set of SqlParameters
			return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[])null);
		}

		/// <summary>
		/// Execute a SqlCommand (that returns no resultset) against the specified SqlConnection 
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>An int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{	
			if( connection == null ) throw new ArgumentNullException( "connection" );

			// Create a command and prepare it for execution
			SqlCommand cmd = new SqlCommand();
			bool mustCloseConnection = false;
			PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
    		
			// Finally, execute the command
			int retval = cmd.ExecuteNonQuery();
    		
			// Detach the SqlParameters from the command object, so they can be used again
			cmd.Parameters.Clear();
			if( mustCloseConnection )
				connection.Close();
			return retval;
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection 
		/// using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>An int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

				// Assign the provided values to these parameters based on parameter order
				AssignParameterValues(commandParameters, parameterValues);

				// Call the overload that takes an array of SqlParameters
				return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlTransaction. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <returns>An int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)
		{
			// Pass through the call providing null for the set of SqlParameters
			return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null);
		}

		/// <summary>
		/// Execute a SqlCommand (that returns no resultset) against the specified SqlTransaction
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>An int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );

			// Create a command and prepare it for execution
			SqlCommand cmd = new SqlCommand();
			bool mustCloseConnection = false;
			PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
    			
			// Finally, execute the command
			int retval = cmd.ExecuteNonQuery();
    			
			// Detach the SqlParameters from the command object, so they can be used again
			cmd.Parameters.Clear();
			return retval;
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified 
		/// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>An int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

				// Assign the provided values to these parameters based on parameter order
				AssignParameterValues(commandParameters, parameterValues);

				// Call the overload that takes an array of SqlParameters
				return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
			}
		}

		#endregion ExecuteNonQuery

		#region ExecuteDataset

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
		/// the connection string. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <returns>A dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
		{
			// Pass through the call providing null for the set of SqlParameters
			return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>A dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );

			// Create & open a SqlConnection, and dispose of it after we are done
			using (SqlConnection connection = new SqlConnection(connectionString))
			{
				connection.Open();

				// Call the overload that takes a connection in place of the connection string
				return ExecuteDataset(connection, commandType, commandText, commandParameters);
			}
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
		/// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>A dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
			
			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

				// Assign the provided values to these parameters based on parameter order
				AssignParameterValues(commandParameters, parameterValues);

				// Call the overload that takes an array of SqlParameters
				return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <returns>A dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
		{
			// Pass through the call providing null for the set of SqlParameters
			return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);
		}
		
		/// <summary>
		/// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>A dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );

			// Create a command and prepare it for execution
			SqlCommand cmd = new SqlCommand();
			bool mustCloseConnection = false;
			PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
    			
			// Create the DataAdapter & DataSet
			using( SqlDataAdapter da = new SqlDataAdapter(cmd) )
			{
				DataSet ds = new DataSet();

				// Fill the DataSet using default values for DataTable names, etc
				da.Fill(ds);
				
				// Detach the SqlParameters from the command object, so they can be used again
				cmd.Parameters.Clear();

				if( mustCloseConnection )
					connection.Close();

				// Return the dataset
				return ds;
			}	
		}
		
		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
		/// using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>A dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

				// Assign the provided values to these parameters based on parameter order
				AssignParameterValues(commandParameters, parameterValues);

				// Call the overload that takes an array of SqlParameters
				return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <returns>A dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)
		{
			// Pass through the call providing null for the set of SqlParameters
			return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null);
		}
		
		/// <summary>
		/// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>A dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );

			// Create a command and prepare it for execution
			SqlCommand cmd = new SqlCommand();
			bool mustCloseConnection = false;
			PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
    			
			// Create the DataAdapter & DataSet
			using( SqlDataAdapter da = new SqlDataAdapter(cmd) )
			{
				DataSet ds = new DataSet();

				// Fill the DataSet using default values for DataTable names, etc
				da.Fill(ds);
    			
				// Detach the SqlParameters from the command object, so they can be used again
				cmd.Parameters.Clear();

				// Return the dataset
				return ds;
			}	
		}
		
		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified 
		/// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>A dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
			
			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

				// Assign the provided values to these parameters based on parameter order
				AssignParameterValues(commandParameters, parameterValues);

				// Call the overload that takes an array of SqlParameters
				return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
			}
		}

		#endregion ExecuteDataset
		
		#region ExecuteReader

		/// <summary>
		/// This enum is used to indicate whether the connection was provided by the caller, or created by SqlHelper, so that
		/// we can set the appropriate CommandBehavior when calling ExecuteReader()
		/// </summary>
		private enum SqlConnectionOwnership	
		{
			/// <summary>Connection is owned and managed by SqlHelper</summary>
			Internal, 
			/// <summary>Connection is owned and managed by the caller</summary>
			External
		}

		/// <summary>
		/// Create and prepare a SqlCommand, and call ExecuteReader with the appropriate CommandBehavior.
		/// </summary>
		/// <remarks>
		/// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.
		/// 
		/// If the caller provided the connection, we want to leave it to them to manage.
		/// </remarks>
		/// <param name="connection">A valid SqlConnection, on which to execute this command</param>
		/// <param name="transaction">A valid SqlTransaction, or 'null'</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>
		/// <param name="connectionOwnership">Indicates whether the connection parameter was provided by the caller, or created by SqlHelper</param>
		/// <returns>SqlDataReader containing the results of the command</returns>
		private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)
		{	
			if( connection == null ) throw new ArgumentNullException( "connection" );

			bool mustCloseConnection = false;
			// Create a command and prepare it for execution
			SqlCommand cmd = new SqlCommand();
			try
			{
				PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
			
				// Create a reader
				SqlDataReader dataReader;

				// Call ExecuteReader with the appropriate CommandBehavior
				if (connectionOwnership == SqlConnectionOwnership.External)
				{
					dataReader = cmd.ExecuteReader();
				}
				else
				{
					dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
				}
			
				// Detach the SqlParameters from the command object, so they can be used again.
				// HACK: There is a problem here, the output parameter values are fletched 
				// when the reader is closed, so if the parameters are detached from the command
				// then the SqlReader can�t set its values. 
				// When this happen, the parameters can�t be used again in other command.
				bool canClear = true;
				foreach(SqlParameter commandParameter in cmd.Parameters)
				{
					if (commandParameter.Direction != ParameterDirection.Input)
						canClear = false;
				}
            
				if (canClear)
				{
					cmd.Parameters.Clear();
				}

				return dataReader;
			}
			catch
			{
				if( mustCloseConnection )
					connection.Close();
				throw;
			}
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
		/// the connection string. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
		public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
		{
			// Pass through the call providing null for the set of SqlParameters
			return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
		public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			SqlConnection connection = null;
			try
			{
				connection = new SqlConnection(connectionString);
				connection.Open();

				// Call the private overload that takes an internally owned connection in place of the connection string
				return ExecuteReader(connection, null, commandType, commandText, commandParameters,SqlConnectionOwnership.Internal);
			}
			catch
			{
				// If we fail to return the SqlDatReader, we need to close the connection ourselves
				if( connection != null ) connection.Close();
				throw;
			}
            
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
		/// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
		public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
			
			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

				AssignParameterValues(commandParameters, parameterValues);

				return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
		public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)
		{
			// Pass through the call providing null for the set of SqlParameters
			return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null);
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
		public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{
			// Pass through the call to the private overload using a null transaction value and an externally owned connection
			return ExecuteReader(connection, (SqlTransaction)null, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
		/// using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
		public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

				AssignParameterValues(commandParameters, parameterValues);

				return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteReader(connection, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
		public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)
		{
			// Pass through the call providing null for the set of SqlParameters
			return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null);
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
		public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );

			// Pass through to private overload, indicating that the connection is owned by the caller
			return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified
		/// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
		public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

				AssignParameterValues(commandParameters, parameterValues);

				return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
			}
		}

		#endregion ExecuteReader

		#region ExecuteScalar
		
		/// <summary>
		/// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in 
		/// the connection string. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
		public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
		{
			// Pass through the call providing null for the set of SqlParameters
			return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null);
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a 1x1 resultset) against the database specified in the connection string 
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
		public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			// Create & open a SqlConnection, and dispose of it after we are done
			using (SqlConnection connection = new SqlConnection(connectionString))
			{
				connection.Open();

				// Call the overload that takes a connection in place of the connection string
				return ExecuteScalar(connection, commandType, commandText, commandParameters);
			}
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in 
		/// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
		public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
			
			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

				// Assign the provided values to these parameters based on parameter order
				AssignParameterValues(commandParameters, parameterValues);

				// Call the overload that takes an array of SqlParameters
				return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlConnection. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
		public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)
		{
			// Pass through the call providing null for the set of SqlParameters
			return ExecuteScalar(connection, commandType, commandText, (SqlParameter[])null);
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
		public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );

			// Create a command and prepare it for execution
			SqlCommand cmd = new SqlCommand();

			bool mustCloseConnection = false;
			PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
    			
			// Execute the command & return the results
			object retval = cmd.ExecuteScalar();
    			
			// Detach the SqlParameters from the command object, so they can be used again
			cmd.Parameters.Clear();

			if( mustCloseConnection )
				connection.Close();

			return retval;
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 
		/// using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
		public static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

				// Assign the provided values to these parameters based on parameter order
				AssignParameterValues(commandParameters, parameterValues);

				// Call the overload that takes an array of SqlParameters
				return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlTransaction. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
		public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)
		{
			// Pass through the call providing null for the set of SqlParameters
			return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[])null);
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
		public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );

			// Create a command and prepare it for execution
			SqlCommand cmd = new SqlCommand();
			bool mustCloseConnection = false;
			PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
    			
			// Execute the command & return the results
			object retval = cmd.ExecuteScalar();
    			
			// Detach the SqlParameters from the command object, so they can be used again
			cmd.Parameters.Clear();
			return retval;
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified
		/// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
		public static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				// PPull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

				// Assign the provided values to these parameters based on parameter order
				AssignParameterValues(commandParameters, parameterValues);

				// Call the overload that takes an array of SqlParameters
				return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
			}
		}

		#endregion ExecuteScalar	

		#region ExecuteXmlReader
		/// <summary>
		/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
		/// <returns>An XmlReader containing the resultset generated by the command</returns>
		public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)
		{
			// Pass through the call providing null for the set of SqlParameters
			return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[])null);
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>An XmlReader containing the resultset generated by the command</returns>
		public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );

			bool mustCloseConnection = false;
			// Create a command and prepare it for execution
			SqlCommand cmd = new SqlCommand();
			try
			{
				PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
			
				// Create the DataAdapter & DataSet
				XmlReader retval = cmd.ExecuteXmlReader();
			
				// Detach the SqlParameters from the command object, so they can be used again
				cmd.Parameters.Clear();

				return retval;
			}
			catch
			{	
				if( mustCloseConnection )
					connection.Close();
				throw;
			}
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
		/// using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="spName">The name of the stored procedure using "FOR XML AUTO"</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>An XmlReader containing the resultset generated by the command</returns>
		public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

				// Assign the provided values to these parameters based on parameter order
				AssignParameterValues(commandParameters, parameterValues);

				// Call the overload that takes an array of SqlParameters
				return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
		/// <returns>An XmlReader containing the resultset generated by the command</returns>
		public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)
		{
			// Pass through the call providing null for the set of SqlParameters
			return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[])null);
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <returns>An XmlReader containing the resultset generated by the command</returns>
		public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );

			// Create a command and prepare it for execution
			SqlCommand cmd = new SqlCommand();
			bool mustCloseConnection = false;
			PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
			
			// Create the DataAdapter & DataSet
			XmlReader retval = cmd.ExecuteXmlReader();
			
			// Detach the SqlParameters from the command object, so they can be used again
			cmd.Parameters.Clear();
			return retval;			
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified 
		/// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36);
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		/// <returns>A dataset containing the resultset generated by the command</returns>
		public static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object[] parameterValues)
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

				// Assign the provided values to these parameters based on parameter order
				AssignParameterValues(commandParameters, parameterValues);

				// Call the overload that takes an array of SqlParameters
				return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
			}
		}

		#endregion ExecuteXmlReader

		#region FillDataset
		/// <summary>
		/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
		/// the connection string. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
		/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
		/// by a user defined name (probably the actual table name)</param>
		public static void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
            
			// Create & open a SqlConnection, and dispose of it after we are done
			using (SqlConnection connection = new SqlConnection(connectionString))
			{
				connection.Open();

				// Call the overload that takes a connection in place of the connection string
				FillDataset(connection, commandType, commandText, dataSet, tableNames);
			}
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
		/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
		/// by a user defined name (probably the actual table name)
		/// </param>
		public static void FillDataset(string connectionString, CommandType commandType,
			string commandText, DataSet dataSet, string[] tableNames,
			params SqlParameter[] commandParameters)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
			// Create & open a SqlConnection, and dispose of it after we are done
			using (SqlConnection connection = new SqlConnection(connectionString))
			{
				connection.Open();

				// Call the overload that takes a connection in place of the connection string
				FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);
			}
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
		/// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
		/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
		/// by a user defined name (probably the actual table name)
		/// </param>    
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		public static void FillDataset(string connectionString, string spName,
			DataSet dataSet, string[] tableNames,
			params object[] parameterValues)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
			// Create & open a SqlConnection, and dispose of it after we are done
			using (SqlConnection connection = new SqlConnection(connectionString))
			{
				connection.Open();

				// Call the overload that takes a connection in place of the connection string
				FillDataset (connection, spName, dataSet, tableNames, parameterValues);
			}
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
		/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
		/// by a user defined name (probably the actual table name)
		/// </param>    
		public static void FillDataset(SqlConnection connection, CommandType commandType, 
			string commandText, DataSet dataSet, string[] tableNames)
		{
			FillDataset(connection, commandType, commandText, dataSet, tableNames, null);
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
		/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
		/// by a user defined name (probably the actual table name)
		/// </param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		public static void FillDataset(SqlConnection connection, CommandType commandType, 
			string commandText, DataSet dataSet, string[] tableNames,
			params SqlParameter[] commandParameters)
		{
			FillDataset(connection, null, commandType, commandText, dataSet, tableNames, commandParameters);
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
		/// using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
		/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
		/// by a user defined name (probably the actual table name)
		/// </param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		public static void FillDataset(SqlConnection connection, string spName, 
			DataSet dataSet, string[] tableNames,
			params object[] parameterValues)
		{
			if ( connection == null ) throw new ArgumentNullException( "connection" );
			if (dataSet == null ) throw new ArgumentNullException( "dataSet" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

				// Assign the provided values to these parameters based on parameter order
				AssignParameterValues(commandParameters, parameterValues);

				// Call the overload that takes an array of SqlParameters
				FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);
			}    
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
		/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
		/// by a user defined name (probably the actual table name)
		/// </param>
		public static void FillDataset(SqlTransaction transaction, CommandType commandType, 
			string commandText,
			DataSet dataSet, string[] tableNames)
		{
			FillDataset (transaction, commandType, commandText, dataSet, tableNames, null);    
		}

		/// <summary>
		/// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
		/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
		/// by a user defined name (probably the actual table name)
		/// </param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		public static void FillDataset(SqlTransaction transaction, CommandType commandType, 
			string commandText, DataSet dataSet, string[] tableNames,
			params SqlParameter[] commandParameters)
		{
			FillDataset(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified 
		/// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <remarks>
		/// This method provides no access to output parameters or the stored procedure's return value parameter.
		/// 
		/// e.g.:  
		///  FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);
		/// </remarks>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
		/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
		/// by a user defined name (probably the actual table name)
		/// </param>
		/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
		public static void FillDataset(SqlTransaction transaction, string spName,
			DataSet dataSet, string[] tableNames,
			params object[] parameterValues) 
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
			if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If we receive parameter values, we need to figure out where they go
			if ((parameterValues != null) && (parameterValues.Length > 0)) 
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

				// Assign the provided values to these parameters based on parameter order
				AssignParameterValues(commandParameters, parameterValues);

				// Call the overload that takes an array of SqlParameters
				FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
			}
			else 
			{
				// Otherwise we can just call the SP without params
				FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);
			}    
		}

		/// <summary>
		/// Private helper method that execute a SqlCommand (that returns a resultset) against the specified SqlTransaction and SqlConnection
		/// using the provided parameters.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
		/// </remarks>
		/// <param name="connection">A valid SqlConnection</param>
		/// <param name="transaction">A valid SqlTransaction</param>
		/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
		/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
		/// by a user defined name (probably the actual table name)
		/// </param>
		/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
		private static void FillDataset(SqlConnection connection, SqlTransaction transaction, CommandType commandType, 
			string commandText, DataSet dataSet, string[] tableNames,
			params SqlParameter[] commandParameters)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );
			if( dataSet == null ) throw new ArgumentNullException( "dataSet" );

			// Create a command and prepare it for execution
			SqlCommand command = new SqlCommand();
			bool mustCloseConnection = false;
			PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
    			
			// Create the DataAdapter & DataSet
			using( SqlDataAdapter dataAdapter = new SqlDataAdapter(command) )
			{
                
				// Add the table mappings specified by the user
				if (tableNames != null && tableNames.Length > 0)
				{
					string tableName = "Table";
					for (int index=0; index < tableNames.Length; index++)
					{
						if( tableNames[index] == null || tableNames[index].Length == 0 ) throw new ArgumentException( "The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames" );
						dataAdapter.TableMappings.Add(tableName, tableNames[index]);
						tableName += (index + 1).ToString();
					}
				}
                
				// Fill the DataSet using default values for DataTable names, etc
				dataAdapter.Fill(dataSet);

				// Detach the SqlParameters from the command object, so they can be used again
				command.Parameters.Clear();
			}

			if( mustCloseConnection )
				connection.Close();
		}
		#endregion
        
		#region UpdateDataset
		/// <summary>
		/// Executes the respective command for each inserted, updated, or deleted row in the DataSet.
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");
		/// </remarks>
		/// <param name="insertCommand">A valid transact-SQL statement or stored procedure to insert new records into the data source</param>
		/// <param name="deleteCommand">A valid transact-SQL statement or stored procedure to delete records from the data source</param>
		/// <param name="updateCommand">A valid transact-SQL statement or stored procedure used to update records in the data source</param>
		/// <param name="dataSet">The DataSet used to update the data source</param>
		/// <param name="tableName">The DataTable used to update the data source.</param>
		public static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)
		{
			if( insertCommand == null ) throw new ArgumentNullException( "insertCommand" );
			if( deleteCommand == null ) throw new ArgumentNullException( "deleteCommand" );
			if( updateCommand == null ) throw new ArgumentNullException( "updateCommand" );
			if( tableName == null || tableName.Length == 0 ) throw new ArgumentNullException( "tableName" ); 

			// Create a SqlDataAdapter, and dispose of it after we are done
			using (SqlDataAdapter dataAdapter = new SqlDataAdapter())
			{
				// Set the data adapter commands
				dataAdapter.UpdateCommand = updateCommand;
				dataAdapter.InsertCommand = insertCommand;
				dataAdapter.DeleteCommand = deleteCommand;

				// Update the dataset changes in the data source
				dataAdapter.Update (dataSet, tableName); 

				// Commit all the changes made to the DataSet
				dataSet.Tables[tableName].AcceptChanges();
			}
		}

		#endregion

		#region CreateCommand
		/// <summary>
		/// Simplify the creation of a Sql command object by allowing
		/// a stored procedure and optional parameters to be provided
		/// </summary>
		/// <remarks>
		/// e.g.:  
		///  SqlCommand command = CreateCommand(conn, "AddOrder", "OrderID", "OrderName");
		/// </remarks>
		/// <param name="connection">A valid SqlConnection object</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="sourceColumns">An array of string to be assigned as the source columns of the stored procedure parameters</param>
		/// <returns>A valid SqlCommand object</returns>
		public static SqlCommand CreateCommand(SqlConnection connection, string spName, params string[] sourceColumns) 
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// Create a SqlCommand
			SqlCommand cmd = new SqlCommand( spName, connection );
			cmd.CommandType = CommandType.StoredProcedure;

			// If we receive parameter values, we need to figure out where they go
			if ((sourceColumns != null) && (sourceColumns.Length > 0)) 
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

				// Assign the provided source columns to these parameters based on parameter order
				for (int index=0; index < sourceColumns.Length; index++)
					commandParameters[index].SourceColumn = sourceColumns[index];

				// Attach the discovered parameters to the SqlCommand object
				AttachParameters (cmd, commandParameters);
			}

			return cmd;
		}
		#endregion

		#region ExecuteNonQueryTypedParams
		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in 
		/// the connection string using the dataRow column values as the stored procedure's parameters values.
		/// This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
		/// </summary>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
		/// <returns>An int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
			
			// If the row has values, the store procedure parameters must be initialized
			if (dataRow != null && dataRow.ItemArray.Length > 0)
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
                
				// Set the parameters values
				AssignParameterValues(commandParameters, dataRow);
                                
				return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
			}
			else
			{
				return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection 
		/// using the dataRow column values as the stored procedure's parameters values.  
		/// This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
		/// </summary>
		/// <param name="connection">A valid SqlConnection object</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
		/// <returns>An int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQueryTypedParams(SqlConnection connection, String spName, DataRow dataRow)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If the row has values, the store procedure parameters must be initialized
			if (dataRow != null && dataRow.ItemArray.Length > 0)
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
                
				// Set the parameters values
				AssignParameterValues(commandParameters, dataRow);
                                
				return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
			}
			else
			{
				return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified
		/// SqlTransaction using the dataRow column values as the stored procedure's parameters values.
		/// This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
		/// </summary>
		/// <param name="transaction">A valid SqlTransaction object</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
		/// <returns>An int representing the number of rows affected by the command</returns>
		public static int ExecuteNonQueryTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// Sf the row has values, the store procedure parameters must be initialized
			if (dataRow != null && dataRow.ItemArray.Length > 0)
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
                
				// Set the parameters values
				AssignParameterValues(commandParameters, dataRow);
                                
				return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
			}
			else
			{
				return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
			}
		}
		#endregion

		#region ExecuteDatasetTypedParams
		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
		/// the connection string using the dataRow column values as the stored procedure's parameters values.
		/// This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
		/// </summary>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
		/// <returns>A dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDatasetTypedParams(string connectionString, String spName, DataRow dataRow)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			//If the row has values, the store procedure parameters must be initialized
			if ( dataRow != null && dataRow.ItemArray.Length > 0)
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
                
				// Set the parameters values
				AssignParameterValues(commandParameters, dataRow);
                
				return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
			}
			else
			{
				return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
		/// using the dataRow column values as the store procedure's parameters values.
		/// This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
		/// </summary>
		/// <param name="connection">A valid SqlConnection object</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
		/// <returns>A dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDatasetTypedParams(SqlConnection connection, String spName, DataRow dataRow)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If the row has values, the store procedure parameters must be initialized
			if( dataRow != null && dataRow.ItemArray.Length > 0)
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
                
				// Set the parameters values
				AssignParameterValues(commandParameters, dataRow);
                
				return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
			}
			else
			{
				return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction 
		/// using the dataRow column values as the stored procedure's parameters values.
		/// This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
		/// </summary>
		/// <param name="transaction">A valid SqlTransaction object</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
		/// <returns>A dataset containing the resultset generated by the command</returns>
		public static DataSet ExecuteDatasetTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If the row has values, the store procedure parameters must be initialized
			if( dataRow != null && dataRow.ItemArray.Length > 0)
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
                
				// Set the parameters values
				AssignParameterValues(commandParameters, dataRow);
                
				return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
			}
			else
			{
				return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
			}
		}

		#endregion

		#region ExecuteReaderTypedParams
		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
		/// the connection string using the dataRow column values as the stored procedure's parameters values.
		/// This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
		/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
		public static SqlDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
			
			// If the row has values, the store procedure parameters must be initialized
			if ( dataRow != null && dataRow.ItemArray.Length > 0 )
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
                
				// Set the parameters values
				AssignParameterValues(commandParameters, dataRow);
                
				return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
			}
			else
			{
				return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
			}
		}

                
		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
		/// using the dataRow column values as the stored procedure's parameters values.
		/// This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <param name="connection">A valid SqlConnection object</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
		/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
		public static SqlDataReader ExecuteReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If the row has values, the store procedure parameters must be initialized
			if( dataRow != null && dataRow.ItemArray.Length > 0)
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
                
				// Set the parameters values
				AssignParameterValues(commandParameters, dataRow);
                
				return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
			}
			else
			{
				return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);
			}
		}
        
		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction 
		/// using the dataRow column values as the stored procedure's parameters values.
		/// This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <param name="transaction">A valid SqlTransaction object</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
		/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
		public static SqlDataReader ExecuteReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If the row has values, the store procedure parameters must be initialized
			if( dataRow != null && dataRow.ItemArray.Length > 0 )
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
                
				// Set the parameters values
				AssignParameterValues(commandParameters, dataRow);
                
				return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
			}
			else
			{
				return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);
			}
		}
		#endregion

		#region ExecuteScalarTypedParams
		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in 
		/// the connection string using the dataRow column values as the stored procedure's parameters values.
		/// This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
		/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
		public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
			
			// If the row has values, the store procedure parameters must be initialized
			if( dataRow != null && dataRow.ItemArray.Length > 0)
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
                
				// Set the parameters values
				AssignParameterValues(commandParameters, dataRow);
                
				return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
			}
			else
			{
				return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 
		/// using the dataRow column values as the stored procedure's parameters values.
		/// This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <param name="connection">A valid SqlConnection object</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
		/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
		public static object ExecuteScalarTypedParams(SqlConnection connection, String spName, DataRow dataRow)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If the row has values, the store procedure parameters must be initialized
			if( dataRow != null && dataRow.ItemArray.Length > 0)
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
                
				// Set the parameters values
				AssignParameterValues(commandParameters, dataRow);
                
				return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
			}
			else
			{
				return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
		/// using the dataRow column values as the stored procedure's parameters values.
		/// This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <param name="transaction">A valid SqlTransaction object</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
		/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
		public static object ExecuteScalarTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If the row has values, the store procedure parameters must be initialized
			if( dataRow != null && dataRow.ItemArray.Length > 0)
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
                
				// Set the parameters values
				AssignParameterValues(commandParameters, dataRow);
                
				return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
			}
			else
			{
				return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
			}
		}
		#endregion

		#region ExecuteXmlReaderTypedParams
		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
		/// using the dataRow column values as the stored procedure's parameters values.
		/// This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <param name="connection">A valid SqlConnection object</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
		/// <returns>An XmlReader containing the resultset generated by the command</returns>
		public static XmlReader ExecuteXmlReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If the row has values, the store procedure parameters must be initialized
			if( dataRow != null && dataRow.ItemArray.Length > 0)
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
                
				// Set the parameters values
				AssignParameterValues(commandParameters, dataRow);
                
				return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
			}
			else
			{
				return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
			}
		}

		/// <summary>
		/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction 
		/// using the dataRow column values as the stored procedure's parameters values.
		/// This method will query the database to discover the parameters for the 
		/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
		/// </summary>
		/// <param name="transaction">A valid SqlTransaction object</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
		/// <returns>An XmlReader containing the resultset generated by the command</returns>
		public static XmlReader ExecuteXmlReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
		{
			if( transaction == null ) throw new ArgumentNullException( "transaction" );
			if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			// If the row has values, the store procedure parameters must be initialized
			if( dataRow != null && dataRow.ItemArray.Length > 0)
			{
				// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
				SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
                
				// Set the parameters values
				AssignParameterValues(commandParameters, dataRow);
                
				return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
			}
			else
			{
				return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
			}
		}
		#endregion

	}

	/// <summary>
	/// SqlHelperParameterCache provides functions to leverage a static cache of procedure parameters, and the
	/// ability to discover parameters for stored procedures at run-time.
	/// </summary>
	public sealed class SqlHelperParameterCache
	{
		#region private methods, variables, and constructors

		//Since this class provides only static methods, make the default constructor private to prevent 
		//instances from being created with "new SqlHelperParameterCache()"
		private SqlHelperParameterCache() {}

		private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());

		/// <summary>
		/// Resolve at run time the appropriate set of SqlParameters for a stored procedure
		/// </summary>
		/// <param name="connection">A valid SqlConnection object</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="includeReturnValueParameter">Whether or not to include their return value parameter</param>
		/// <returns>The parameter array discovered.</returns>
		private static SqlParameter[] DiscoverSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			SqlCommand cmd = new SqlCommand(spName, connection);
			cmd.CommandType = CommandType.StoredProcedure;

			connection.Open();
			SqlCommandBuilder.DeriveParameters(cmd);
			connection.Close();

			if (!includeReturnValueParameter) 
			{
				cmd.Parameters.RemoveAt(0);
			}
                
			SqlParameter[] discoveredParameters = new SqlParameter[cmd.Parameters.Count];

			cmd.Parameters.CopyTo(discoveredParameters, 0);

			// Init the parameters with a DBNull value
			foreach (SqlParameter discoveredParameter in discoveredParameters)
			{
				discoveredParameter.Value = DBNull.Value;
			}
			return discoveredParameters;
		}

		/// <summary>
		/// Deep copy of cached SqlParameter array
		/// </summary>
		/// <param name="originalParameters"></param>
		/// <returns></returns>
		private static SqlParameter[] CloneParameters(SqlParameter[] originalParameters)
		{
			SqlParameter[] clonedParameters = new SqlParameter[originalParameters.Length];

			for (int i = 0, j = originalParameters.Length; i < j; i++)
			{
				clonedParameters[i] = (SqlParameter)((ICloneable)originalParameters[i]).Clone();
			}

			return clonedParameters;
		}

		#endregion private methods, variables, and constructors

		#region caching functions

		/// <summary>
		/// Add parameter array to the cache
		/// </summary>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <param name="commandParameters">An array of SqlParamters to be cached</param>
		public static void CacheParameterSet(string connectionString, string commandText, params SqlParameter[] commandParameters)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );

			string hashKey = connectionString + ":" + commandText;

			paramCache[hashKey] = commandParameters;
		}

		/// <summary>
		/// Retrieve a parameter array from the cache
		/// </summary>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="commandText">The stored procedure name or T-SQL command</param>
		/// <returns>An array of SqlParamters</returns>
		public static SqlParameter[] GetCachedParameterSet(string connectionString, string commandText)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );

			string hashKey = connectionString + ":" + commandText;

			SqlParameter[] cachedParameters = paramCache[hashKey] as SqlParameter[];
			if (cachedParameters == null)
			{			
				return null;
			}
			else
			{
				return CloneParameters(cachedParameters);
			}
		}

		#endregion caching functions

		#region Parameter Discovery Functions

		/// <summary>
		/// Retrieves the set of SqlParameters appropriate for the stored procedure
		/// </summary>
		/// <remarks>
		/// This method will query the database for this information, and then store it in a cache for future requests.
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <returns>An array of SqlParameters</returns>
		public static SqlParameter[] GetSpParameterSet(string connectionString, string spName)
		{
			return GetSpParameterSet(connectionString, spName, false);
		}

		/// <summary>
		/// Retrieves the set of SqlParameters appropriate for the stored procedure
		/// </summary>
		/// <remarks>
		/// This method will query the database for this information, and then store it in a cache for future requests.
		/// </remarks>
		/// <param name="connectionString">A valid connection string for a SqlConnection</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
		/// <returns>An array of SqlParameters</returns>
		public static SqlParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)
		{
			if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			using(SqlConnection connection = new SqlConnection(connectionString))
			{
				return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);
			}
		}

		/// <summary>
		/// Retrieves the set of SqlParameters appropriate for the stored procedure
		/// </summary>
		/// <remarks>
		/// This method will query the database for this information, and then store it in a cache for future requests.
		/// </remarks>
		/// <param name="connection">A valid SqlConnection object</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <returns>An array of SqlParameters</returns>
		internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName)
		{
			return GetSpParameterSet(connection, spName, false);
		}

		/// <summary>
		/// Retrieves the set of SqlParameters appropriate for the stored procedure
		/// </summary>
		/// <remarks>
		/// This method will query the database for this information, and then store it in a cache for future requests.
		/// </remarks>
		/// <param name="connection">A valid SqlConnection object</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
		/// <returns>An array of SqlParameters</returns>
		internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );
			using (SqlConnection clonedConnection = (SqlConnection)((ICloneable)connection).Clone())
			{
				return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);
			}
		}

		/// <summary>
		/// Retrieves the set of SqlParameters appropriate for the stored procedure
		/// </summary>
		/// <param name="connection">A valid SqlConnection object</param>
		/// <param name="spName">The name of the stored procedure</param>
		/// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
		/// <returns>An array of SqlParameters</returns>
		private static SqlParameter[] GetSpParameterSetInternal(SqlConnection connection, string spName, bool includeReturnValueParameter)
		{
			if( connection == null ) throw new ArgumentNullException( "connection" );
			if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

			string hashKey = connection.ConnectionString + ":" + spName + (includeReturnValueParameter ? ":include ReturnValue Parameter":"");

			SqlParameter[] cachedParameters;
        	
			cachedParameters = paramCache[hashKey] as SqlParameter[];
			if (cachedParameters == null)
			{	
				SqlParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);
				paramCache[hashKey] = spParameters;
				cachedParameters = spParameters;
			}
        	
			return CloneParameters(cachedParameters);
		}
        
		#endregion Parameter Discovery Functions

	}
}