private void Button_Click_2(object sender, RoutedEventArgs e)
 {
     ExitConfirmationResult = ExitConfirmationResult.SaveAndExit;
     this.Close();
 }
 private void Button_Click(object sender, RoutedEventArgs e)
 {
     ExitConfirmationResult = ExitConfirmationResult.Cancel;
     this.Close();
 }