public RoomRental Add(RoomRental item)
{
var newRoomRental = (RoomRental)item.Clone();
newRoomRental.Id = !_roomRentals.Any() ? 1 : _roomRentals.Max(car => car.Id) + 1;
_roomRentals.Add(newRoomRental);
return (RoomRental)newRoomRental.Clone();
}
public RoomRental Update(RoomRental item)
{
var existRoomRental = _roomRentals.SingleOrDefault(roomRental => roomRental.Id == item.Id);
if (existRoomRental == null)
{
throw new NullReferenceException();
}
existRoomRental.Address = item.Address;
return (RoomRental)existRoomRental.Clone();
}