public async Task <IActionResult> Create([Bind("Name,Class,Status,Id")] Waiter waiter)
        {
            if (ModelState.IsValid)
            {
                _context.Add(waiter);
                await _context.SaveChangesAsync();

                return(RedirectToAction(nameof(Index)));
            }
            return(View(waiter));
        }
        public async Task <IActionResult> Create([Bind("ReservationHolderId,WaiterId,Date,Time")] Reservation reservation)
        {
            var reservationsOwnByThisWaiter = _context.Reservations
                                              .Where(r => r.WaiterId == reservation.WaiterId).Count();
            var classOfWaiter = _context.Waiters.FirstOrDefault(w => w.Id == reservation.WaiterId).Class;

            if (reservationsOwnByThisWaiter <= classOfWaiter)
            {
                if (ModelState.IsValid)
                {
                    _context.Add(reservation);
                    await _context.SaveChangesAsync();

                    return(RedirectToAction(nameof(Index)));
                }
            }
            else
            {
                return(RedirectToPage("ErrorClassOfWaiter", "Reservations"));
            }
            ViewData["ReservationHolderId"] = new SelectList(_context.Users, "Id", "Username", reservation.ReservationHolderId);
            ViewData["WaiterId"]            = new SelectList(_context.Waiters, "Id", "Name", reservation.WaiterId);
            return(View(reservation));
        }