public ActionResult EditPublisher(int id)
        {
            LibraryManagementSystemContext context = new LibraryManagementSystemContext();
            PublishersRepository publishersRepository = new PublishersRepository(context);
            PublishersEditPublisherVM model = new PublishersEditPublisherVM();

            Publisher publisher = publishersRepository.GetByID(id);
            if (id > 0)
            {
                if (publisher == null)
                {
                    return RedirectToAction("Index", "Publishers");
                }

                model.ID = publisher.ID;
                model.Name = publisher.Name;
                model.Address = publisher.Address;
            }

            return View(model);
        }
        public ActionResult EditPublisher(PublishersEditPublisherVM model)
        {
            LibraryManagementSystemContext context = new LibraryManagementSystemContext();
            PublishersRepository publishersRepository = new PublishersRepository(context);

            Publisher publisher = null;
            if (!ModelState.IsValid)
            {
                return View(model);
            }
            else
            {
                if (model.ID > 0)
                {
                    publisher = publishersRepository.GetByID(model.ID);
                }
                else
                {
                    publisher = new Publisher();
                }

                publisher.ID = model.ID;
                publisher.Name = model.Name;
                publisher.Address = model.Address;

                publishersRepository.Save(publisher);
            }

            return RedirectToAction("Index", "Publishers");
        }