Rijndael algo for Encryption and Decryption of Password

[bhavna_816]

I am trying to encrypt and decrypt the password in ASP.NEt2.0 application with Rijndael
algo.
I am able to encrypt the password but not able to decrypt it.

Can anybody tell me what is the problem with my code,

I am pasting it here

public static string Encrypt(string StringToEncrypt, string Key)
        {
            Rijndael _encryptionservice = new RijndaelManaged();
            ICryptoTransform _encryptor;
            byte[] _bytesdata;
            byte[] _byteskey;
            string _encryptedstring;

            Key = Key.ToLower();
            _bytesdata = Encoding.ASCII.GetBytes(StringToEncrypt.PadRight(16));
            _byteskey = Encoding.ASCII.GetBytes(Key.PadRight(32).Substring(0, 32));

            _encryptionservice.Mode = CipherMode.CBC;
            _encryptionservice.Key = _byteskey;
            //_encryptionservice.IV = Encoding.ASCII.GetBytes("VIMSuitEncoding");

            _encryptor = _encryptionservice.CreateEncryptor();

            MemoryStream _memstreamencrypteddata = new MemoryStream();

            CryptoStream encStream = new CryptoStream(_memstreamencrypteddata, _encryptor, CryptoStreamMode.Write);
            try
            {
                encStream.Write(_bytesdata, 0, _bytesdata.Length);
            }
            catch (Exception ex)
            {
                throw new Exception("Error while writing encrypted data to the stream", ex);
            }
            encStream.FlushFinalBlock();
            encStream.Close();

            _encryptedstring = Convert.ToBase64String(_memstreamencrypteddata.ToArray());

            return _encryptedstring;
        }

public static string Decrypt(string StringToDecrypt, string Key)
        {
            Rijndael _encryptionservice = new RijndaelManaged();
            byte[] _bytesdata;
            byte[] _byteskey;
            string _encryptedstring;
            ICryptoTransform _decryptor;
            int _decryptedstringlength;

            Key = Key.ToLower();

            _bytesdata = Convert.FromBase64String(StringToDecrypt);
            _byteskey = Encoding.ASCII.GetBytes(Key.PadRight(32).Substring(0, 32));

            _encryptionservice.Mode =CipherMode.CBC;
            _encryptionservice.Key = _byteskey;
            //_encryptionservice.IV = Encoding.ASCII.GetBytes("VIMSuitEncoding");

            _decryptor = _encryptionservice.CreateDecryptor();

            MemoryStream _memstreamencrypteddata = new MemoryStream(_bytesdata);
            CryptoStream encStream = new CryptoStream(_memstreamencrypteddata, _decryptor, CryptoStreamMode.Read);
            //_bytesdata = new byte[_bytesdata.Length];

            try
            {
                _decryptedstringlength = encStream.Read(_bytesdata, 0, _bytesdata.Length);
            }
            catch (Exception ex)
            {
                throw new Exception("Error while writing encrypted data to the stream", ex);
            }

            encStream.Close();

            //_encryptedstring = Convert.ToString(Encoding.ASCII.GetChars(_memstreamencrypteddata.ToArray())).Substring(0, _decryptedstringlength);

            try
            {
                _encryptedstring = Convert.ToString(Encoding.ASCII.GetChars(_memstreamencrypteddata.ToArray())).Substring(0, _decryptedstringlength);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }                       
            return _encryptedstring.Trim();
        }
    }