public IActionResult AddReservation(BookRoom book) { if (ModelState.IsValid) { Guest guest = _guestRepository.FindGuestById(book.guest.GuestId); if (guest == null) { _guestRepository.AddNewGuest(book.guest); } Booking newBook = new Booking() { CheckIn = checkIn, CheckOut = checkOut, RoomId = book.RoomId, GuestId = book.guest.GuestId }; _bookRepository.AddNewReservation(newBook); } return(RedirectToAction("Index", "Home")); }