private void buttonVehicleEdit_Click(object sender, EventArgs e) { if (listBoxVehicle.SelectedItem is Vehicle vehicle) { if (DBController.TryCheckOpenBookingVehicle(vehicle, out bool result)) { if (!result) { new EditDataView(vehicle).ShowDialog(); } else { Feedback.ErrorDatabaseBookedVehicleEdit(); } } } else { Feedback.ErrorNoSelectedItem(); } }