private void btnAddComictoOrder_Click(object sender, RoutedEventArgs e) { var _customerID = _customer.CustomerID; var _comicID = _comic.ComicID; var _date = DateTime.Now; var _comicManager = new ComicManager(); var mainWindow = new MainWindow(); try { _comicManager.AddComicToOrderForm(_customerID, (int)_comicID, _date); MessageBox.Show("Comic added to your order."); Close(); } catch (Exception ex) { MessageBox.Show("Unable to add comic to order" + ex.Message + ex.StackTrace); } }