Encrypt and Decrypt class

 #region Encrypt
        public string Encrypt(string simpletext, string keys)
        {
            try
            {
                XCryptEngine xe = new XCryptEngine();

                xe.Algorithm = XCrypt.XCryptEngine.AlgorithmType.DES; //DES = Data Encryption Standard

                string cipher = xe.Encrypt(simpletext, keys);
                if (cipher != null)
                    return (cipher);
                else
                    return null;
            }

            catch (Exception ex)
            {
                return null;
            }
        }
        #endregion

        #region Decrypt
        public string Decrypt(string simpletext, string keys)
        {
            try
            {
                XCryptEngine xe = new XCryptEngine();

                xe.Algorithm = XCrypt.XCryptEngine.AlgorithmType.DES;

                //  Console.WriteLine(xe.Decrypt(ciphertext, Days));
                simpletext = simpletext.Replace(" ", "+");
                string cipertext = xe.Decrypt(simpletext, keys);
                if (cipertext != null)
                    return (cipertext);
                else
                    return null;
            }
            catch (Exception ex)
            {
                return null;
            }
        }
        #endregion