public IActionResult UpdateConcert(int id)
        {
            Concert     model     = _context.Concerts.Find(id);
            ConcertForm formModel = new ConcertForm
            {
                ConcertID        = model.ConcertID,
                Venue            = model.Venue,
                Address          = model.Address,
                PostCode         = model.PostCode,
                Area             = model.Area,
                Date             = model.Date,
                Time             = model.Time,
                Price            = model.Price,
                RemainingTickets = model.RemainingTickets
            };

            return(View(formModel));
        }
        public IActionResult UpdateConcert(ConcertForm model)
        {
            if (ModelState.IsValid)
            {
                Concert editConcert = new Concert
                {
                    ConcertID        = model.ConcertID,
                    Venue            = model.Venue,
                    Address          = model.Address,
                    PostCode         = model.PostCode,
                    Area             = model.Area,
                    Date             = model.Date,
                    Time             = model.Time,
                    Price            = model.Price,
                    RemainingTickets = model.RemainingTickets
                };
                _context.Concerts.Update(editConcert);

                _context.SaveChanges();
                return(RedirectToAction("Index"));
            }
            return(View(model));
        }