public static string EncryptWithMD5(string source)

        {

            byte[] sor = Encoding.UTF8.GetBytes(source);

            MD5 md5 = MD5.Create();

            byte[] result = md5.ComputeHash(sor);

            StringBuilder strbul = new StringBuilder();

            for (int i = ; i < result.Length; i++)

            {

                strbul.Append(result[i].ToString("x2"));//加密结果"x2"结果为32位,"x3"结果为48位,"x4"结果为64位

            }

            return strbul.ToString();

        }