private void StartAd()
 {
     if (_adWindow != null)
     {
         return;
     }
     _adWindow         = new AdWindow(this);
     _adWindow.Closed += AdWindowOnClosed;
     _adWindow.Top     = Top + 400;
     _adWindow.Left    = Left + 240;
     _adWindow.Show();
 }
 private void AdWindowOnClosed(object sender, EventArgs eventArgs)
 {
     _adWindow.Closed -= AdWindowOnClosed;
     _adWindow         = null;
 }