public static string ConvertToMD5Pass(string srcStr)
        {
            MD5 md5 = MD5.Create();
            byte[] source = md5.ComputeHash(Encoding.UTF8.GetBytes(srcStr));
            StringBuilder sBuilder = new StringBuilder();
            for (int i = 0; i < source.Length; i++)
            {
                sBuilder.Append(source[i].ToString("x").PadLeft(2, '0'));
            }

            string convertresult = sBuilder.ToString();
            return convertresult;
        }