The HttpServerUtility.UrlTokenDecode(string) method converts a URL string token, which encodes binary data as base 64 digits, to its equivalent byte array representation. Use the HttpServerUtility.UrlTokenDecode(string) method to decode tokens transmitted on the URL and encoded by using the HttpServerUtility.UrlTokenEncode(Byte[]).

The HttpServerUtility.UrlTokenDecode(string) method will return an empty byte array if the input parameter has a length of less than one.