private void Admin_CityDelete_Click(object sender, RoutedEventArgs e) { ConfirmBox confirm = new ConfirmBox(); confirm.ShowDialog(); if (confirm.okClick == false) { return; } Service.DeleteCity((int)Admin_CityCombo.SelectedValue, username, password); Admin_CityCombo.ItemsSource = Service.GetComboCity().Tables[0].DefaultView; }