public string EncodeMD5(string stre)
        {

            Byte***91;***93; buffer; cres = "";
            buffer = Encoding.Default.GetBytes(stre);
            try
            {
                MD5CryptoServiceProvider check = new MD5CryptoServiceProvider();
                Byte***91;***93; somme;
                somme = check.ComputeHash(buffer);
                string ret = "";

                foreach (byte a in somme)
                {
                    if (a < 16) ret += "0" + a.ToString("X");
                    else ret += a.ToString("X");
                }
                cres = ret;
                return ret;
            }
            catch (System.Exception)
            {
                cres = "Error";
                return cres;
            }

        }

using System.Security.Cryptography;