private string EncryptSerial()
 {
     LCryp lc = new LCryp();
     return lc.Encrypt(_key);
 }
 private void WriteEmail()
 {
     RegistryKey check = Registry.LocalMachine.OpenSubKey("Software\\ManadgementApps");
     if (check != null)
     {
         LCryp lc = new LCryp();
         RegistryKey root = Registry.LocalMachine.CreateSubKey("Software\\ManadgementApps");
         root.SetValue("MA",lc.Encrypt(mailTextBox.Text),RegistryValueKind.String);
     }
 }