public void UpdateCinemaShow(CinemaShowDTO cinemaShow)
        {
            if (cinemaShow == null)
            {
                throw new ArgumentNullException(nameof(cinemaShow));
            }

            _context.SaveChanges();
        }
        public void BookShow(CinemaShowDTO cinemaShow, SeatDTO seat)
        {
            if (cinemaShow == null)
            {
                throw new ArgumentNullException(nameof(cinemaShow));
            }

            if (seat == null)
            {
                throw new ArgumentNullException(nameof(seat));
            }

            var booking = new BookingDTO
            {
                CinemaShow = cinemaShow,
                Seat       = seat,
                IsBooked   = true
            };

            _context.Bookings.Add(booking);
            _context.SaveChanges();
        }