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ZIP Code Utility

, 2 Jan 2005 CPOL 116.2K 3K 85
This article provides an easy method to lookup a U.S. City/State by ZIP Code, or one or more ZIP Codes by City/State. It also describes a method to calculate the distance between two ZIP Codes and find all other ZIP Codes within a radius of X miles of a specified ZIP Code.
/// <project>ZipCodeUtil</project>
/// <assembly>SagaraSoftware.ZipCodeUtil.dll</assembly>
/// <filename>IDataProvider.cs</filename>
/// <creator>Jon Sagara</creator>
/// <description>
/// Contains the IDataProvider interface and the DataProvider class.
/// The original MS Access database was obtained from CFDynamics at 
/// </description>
/// <copyright>
/// Copyright (c) 2004 Sagara Software.  All rights reserved.
/// </copyright>
/// <disclaimer>
/// This file is provided "as is" with no expressed or implied warranty.  The author accepts no 
///  liability for any damage/loss of business that this product may cause.
/// </disclaimer>
/// <history>
///	<change date="12/29/2004" changedby="Jon Sagara">File created.</changed>
/// </history>

using System;

namespace SagaraSoftware.ZipCodeUtil
	/// <summary>
	/// Defines methods common to all data providers.  An instance of this interface is used to 
	///  interact with the ZIP Codes database.  
	/// </summary>
	public interface IDataProvider
		Location DoLookupByZipCode (string inZipCode);
		Location[] DoLookupByCityState (string inCity, string inState);
		LocationInRadius[] GetLocationsWithinRadius (Location inRefLoc, RadiusBox inBounds);

	/// <summary>
	/// The DataProvider class has only one static method that returns an instance of a class that
	/// defines the IDataProvider interface.  The type of instance returned is determined by the
	/// "ZipCodeProviderType" key in the component host's application config file.  Supported types
	/// are Access, MS SQL, and MySQL.
	/// </summary>
	public class DataProvider
		public static IDataProvider GetDataProvider ()
			string strProviderType = System.Configuration.ConfigurationSettings.AppSettings["ZipCodeProviderType"];

			if (null == strProviderType || string.Empty == strProviderType)
				throw new ApplicationException ("The host application must define the ZipCodeProviderType key in the config file.");

			switch (strProviderType.ToUpper ())
				case "ACCESS":
					return new AccessProvider ();
				case "MSSQL":
					throw new NotImplementedException ("SqlProvider is not yet implemented");
				case "MYSQL":
					throw new NotImplementedException ("MySqlProvider is not yet implemented");
					throw new ApplicationException ("Invalid database provider type specified in config file.");

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


About the Author

Jon Sagara
Software Developer (Senior) Sagara Software, Inc.
United States United States
Jon is a senior software developer who loves solving problems with the .NET framework.

When he's not fooling around with computers or reading, he's busy spending time with his super wife, Kelly, and his three boys. He also likes to take his mountain bike for a spin.

Visit my blog

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