public void ReserveRoom()
        {
            _selectedRoom.Add(_accomodationReservation.ReservationPeriod);

            _reservationRepository.AddHotelReservation(new AccomodationReservation(Accomodation, _accomodationReservation.ReservationPeriod, _selectedRoom));
            DataManagementService.Instance.SaveData();
            MessageBox.Show("Successful");
        }