private void BtnUsun_Click(object sender, RoutedEventArgs e) { var Res = MessageBox.Show("Usunąć ?", "Usuwanie pozycji", MessageBoxButton.YesNo, MessageBoxImage.Exclamation); if (Res == MessageBoxResult.Yes) { PanelTrace_db.UsunTraceMaterial(rowTraceMaterial); listTraceMaterial = PanelTrace_db.PobierzTraceMaterial(); grdLista.ItemsSource = listTraceMaterial; } }