public void Unsubscribe()
 {
     if (EventWatcher == null)
     {
         return;
     }
     EventWatcher.EventArrived -= EventWatcher_EventArrived;
     EventWatcher.Stop();
     EventWatcher = null;
 }
 private void FrmUSBPrep_OnClosing(object sender, CancelEventArgs e)
 {
     Reg.RestoreAutoPlay();
     watcher.Stop();
 }