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Validates the zip code with regular expression

//Microsoft Public License (Ms-PL) //http://c4fdevkit.codeplex.com/license using System; using System.Collections.Generic; using System.Text; using System.Text.RegularExpressions; namespace C4F.DevKit.WebServices {     /// <summary>     /// Provides useful methods like conversion methods.     /// </summary>     public static class Utility     {         /// <summary>         /// Validates the zip code         /// </summary>         /// <param name="zipCode">Zip code</param>         /// <returns>True if zip code is valid</returns>         public static bool ValidateZipCode(string zipCode)         {             if (String.IsNullOrEmpty(zipCode))                 return false;             return Regex.IsMatch(zipCode, "(^[0-9]{5}$)|(^[0-9]{5}-[0-9]{4}$)");         }             } }