private void RemoveAppointmentButton_Click(object sender, EventArgs e) { try { if (businessLogic.ReadSingleAppointment(date, time) != null) { if (MessageBox.Show("Potwierdź usunięcie wizyty.", "Usuwanie...", MessageBoxButtons.OKCancel) == DialogResult.OK) { businessLogic.DeleteAppointment(date, time); Close(); } else { Close(); } } else { MessageBox.Show("Nie możesz usunąć pustego pola."); } } catch (Exception ex) { MessageBox.Show("Błąd : \n" + ex); } }