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Url Encode 3

using System; using System.ComponentModel; using System.Diagnostics; using System.IO; using System.Net; using System.Text; using System.Text.RegularExpressions; using System.Web; using System.Xml; using System.Xml.Serialization; using System.Collections.Generic; using System.Drawing; public static class Utility {     const string UnreservedChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_.~";     /// <summary>     /// This is a different Url Encode implementation since the default .NET one outputs the percent encoding in lower case.     /// While this is not a problem with the percent encoding spec, it is used in upper case throughout OAuth     /// </summary>     /// <param name="value">The value to Url encode</param>     /// <returns>Returns a Url encoded string</returns>     public static string UrlEncode(string value)     {         var result = new StringBuilder();         foreach (char symbol in value)         {             if (UnreservedChars.IndexOf(symbol) != -1)             {                 result.Append(symbol);             }             else             {                 //some symbols produce > 2 char values so the system urlencoder must be used to get the correct data                 if (String.Format("{0:X2}", (int)symbol).Length > 3)                 {                     // ReSharper disable PossibleNullReferenceException                     result.Append(HttpUtility.UrlEncode(value.Substring(value.IndexOf(symbol), 1)).ToUpper());                     // ReSharper restore PossibleNullReferenceException                 }                 else                 {                     result.Append('%' + String.Format("{0:X2}", (int)symbol));                 }             }         }         return result.ToString();     } }