public IActionResult Edit(int id, [Bind("StartDate,EndDate,IsActive,CustomerId,RoomId")] Booking booking)
        {
            if (id != booking.Id)
            {
                return(NotFound());
            }

            if (ModelState.IsValid)
            {
                try
                {
                    bookingManager.EditBooking(booking);
                }
                catch (DbUpdateConcurrencyException)
                {
                    if (bookingManager.GetBooking(booking.Id) == null)
                    {
                        return(NotFound());
                    }
                    else
                    {
                        throw;
                    }
                }
                return(RedirectToAction(nameof(Index)));
            }
            ViewData["CustomerId"] = new SelectList(customerManager.GetAllCustomers(), "Id", "Name", booking.CustomerId);
            ViewData["RoomId"]     = new SelectList(roomManager.GetAll(), "Id", "Description", booking.RoomId);
            return(View(booking));
        }