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A Beginner's Tutorial for Understanding Transactions and TransactionScope in ADO.NET

, 4 Jan 2013 CPOL
This article is a beginner's tutorial for understanding what are transactions and how can transactions be implemented using .Net framework and ADO.NET for any ASP.NET web application or any other database driven application.
TransactionScopeDemo.zip
TransactionScopeDemo
App_Code
App_Data
SampleDb.mdf
SampleDb_log.LDF
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page 
{
    readonly string CONNECTION_STRING = ConfigurationManager.ConnectionStrings["SampleDbConnectionString1"].ConnectionString;
    
    protected void Page_Load(object sender, EventArgs e)
    {
        if (IsPostBack == false)
        {
            UpdateAmount();
        }        
    }

    protected void btnAccount1_Click(object sender, EventArgs e)
    {
        // Lets just hard code some values for demo purpose
        double amount = 0.0;
        double.TryParse(txtAmount.Text, out amount);

        PerformTransaction("2", "1", amount);
    }

    protected void btnAccount2_Click(object sender, EventArgs e)
    {   
        // Lets just hard code some values for demo purpose
        double amount = 0.0;
        double.TryParse(txtAmount.Text, out amount);

        PerformTransaction("1", "2", amount);
    }

    private void PerformTransaction(string creditAccountID, string debitAccountID, double amount)
    {
        SqlTransaction transaction = null;
        SqlConnection con = null;

        // they will be used to decide whether to commit or rollback the transaction
        bool debitResult = false;
        bool creditResult = false;

        try
        {
            con = new SqlConnection(CONNECTION_STRING);
            con.Open();

            // lets begin a transaction here
            transaction = con.BeginTransaction();

            // Let us do a debit first
            using (SqlCommand cmd = con.CreateCommand())
            {
                cmd.CommandType = CommandType.Text;
                cmd.CommandText = string.Format(
                    "update Account set Amount = Amount - {0} where ID = {1}",
                    amount, debitAccountID);

                // assosiate this command with transaction
                cmd.Transaction = transaction;

                debitResult = cmd.ExecuteNonQuery() == 1;
            }

            // A dummy throw just to check whether the transaction are working or not
            //throw new Exception("Let see..."); // uncomment this line to see the transaction in action

            // And now do a credit
            using (SqlCommand cmd = con.CreateCommand())
            {
                cmd.CommandType = CommandType.Text;
                cmd.CommandText = string.Format(
                    "update Account set Amount = Amount + {0} where ID = {1}",
                    amount, creditAccountID);

                // assosiate this command with transaction
                cmd.Transaction = transaction;

                creditResult = cmd.ExecuteNonQuery() == 1;
            }


            if (debitResult && creditResult)
            {
                transaction.Commit();
            }
        }
        catch
        {
            transaction.Rollback();            
        }
        finally
        {
            con.Close();
        }

        UpdateAmount();
    }

    private void UpdateAmount()
    {
        // Lets show the updated balance to the user
        DataTable table = null;

        using (SqlConnection con = new SqlConnection(CONNECTION_STRING))
        {
            using (SqlCommand cmd = con.CreateCommand())
            {
                cmd.CommandType = CommandType.Text;
                cmd.CommandText = "select * from Account";

                try
                {
                    con.Open();
                    using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                    {
                        table = new DataTable();
                        da.Fill(table);
                    }
                }
                catch (Exception ex)
                {
                    throw ex;
                }
            }
        }

        if (table != null)
        {
            GridView1.DataSource = table;
            GridView1.DataBind();
        }
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Rahul Rajat Singh
Architect
India India
I Started my Programming career with C++. Later got a chance to develop Windows Form applications using C#. Currently using C#, ASP.NET & ASP.NET MVC to create Information Systems, e-commerce/e-governance Portals and Data driven websites.

My interests involves Programming, Website development and Learning/Teaching subjects related to Computer Science/Information Systems. IMO, C# is the best programming language and I love working with C# and other Microsoft Technologies.
  • Microsoft Certified Technology Specialist (MCTS): Web Applications Development with Microsoft .NET Framework 4
  • Microsoft Certified Technology Specialist (MCTS): Accessing Data with Microsoft .NET Framework 4
  • Microsoft Certified Technology Specialist (MCTS): Windows Communication Foundation Development with Microsoft .NET Framework 4
 
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