C# MD5 加密 string->string

        private string MD5Encode(string text)        {            MD5 md5 = MD5.Create();            byte[] en = md5.ComputeHash(Encoding.Default.GetBytes(text));            StringBuilder sBuilder = new StringBuilder();            for (int i = 0; i < en.Length; i++)            {                sBuilder.Append(en[i].ToString("x"));            }            return sBuilder.ToString();         }