UrlDecode

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public static string UrlDecode ( string queryString, string key, Encoding encoding )
{
	key += "=";
	int start = queryStringIndexOf ( key ) + key.Length;
	int end = queryString.IndexOf ( "&", start );
	if ( end == -1 )
	{
		end = queryString.Length;
	}
	string val = queryString.Substring ( start, end - start );

	return System.Web.HttpUtility.UrlDecode ( val, encoding );
}