private void btn_Add_Click(object sender, EventArgs e)
        {
            Form f = new Reservation_edit(myBL);

            f.ShowDialog();
            reservationIDListBoxRefresh();
        }
        private void btn_Edit_Click(object sender, EventArgs e)
        {
            Form f = new Reservation_edit(myBL, (Reservation)reservationIDListBox.SelectedItem);

            f.ShowDialog();
            reservationIDListBoxRefresh();
        }
 private void btn_Edit_Click(object sender, EventArgs e)
 {
     Form f = new Reservation_edit(myBL, (Reservation)reservationIDListBox.SelectedItem);
     f.ShowDialog();
     reservationIDListBoxRefresh();
 }
 private void btn_Add_Click(object sender, EventArgs e)
 {
     Form f = new Reservation_edit(myBL);
     f.ShowDialog();
     reservationIDListBoxRefresh();
 }