public void refreshReservations()
{
ReservationsService reservationsService = new ReservationsService();
List <Reservation> reservations = reservationsService.getAll();
reservationsList.Items.Clear();
foreach (Reservation reservation in reservations)
{
ListViewItem item = new ListViewItem(reservation.Id.ToString());
item.SubItems.Add(reservation.customer.ToString());
item.SubItems.Add(reservation.book.ToString());
reservationsList.Items.Add(item);
}
}