public static string EncryptPassword(string sPASSWORD, Guid gKEY, Guid gIV)

{

    UTF8Encoding utf8 = new UTF8Encoding(false);

 string sResult = null;

 byte[] byPassword = utf8.GetBytes(sPASSWORD);

 using ( MemoryStream stm = new MemoryStream() )

    {

        Rijndael rij = Rijndael.Create();

        rij.Key = gKEY.ToByteArray();

        rij.IV  = gIV.ToByteArray();

 using ( CryptoStream cs = new CryptoStream(stm, rij.CreateEncryptor(), CryptoStreamMode.Write) )

        {

            cs.Write(byPassword, 0, byPassword.Length);

            cs.FlushFinalBlock();

            cs.Close();

        }

        sResult = Convert.ToBase64String(stm.ToArray());

    }

 return sResult;

}

public static string DecryptPassword(string sPASSWORD, Guid gKEY, Guid gIV)

{

    UTF8Encoding utf8 = new UTF8Encoding(false);

 string sResult = null;

 byte[] byPassword = Convert.FromBase64String(sPASSWORD);

 using ( MemoryStream stm = new MemoryStream() )

    {

        Rijndael rij = Rijndael.Create();

        rij.Key = gKEY.ToByteArray();

        rij.IV  = gIV.ToByteArray();

 using ( CryptoStream cs = new CryptoStream(stm, rij.CreateDecryptor(), CryptoStreamMode.Write) )

        {

            cs.Write(byPassword, 0, byPassword.Length);

            cs.Flush();

            cs.Close();

        }

 byte[] byResult = stm.ToArray();

        sResult = utf8.GetString(byResult, 0, byResult.Length);

    }

 return sResult;

}