BookManagement.Controllers.AdminController.Edit C# (CSharp) Method

        public ActionResult Edit(int id = 0)
        {
            var allCategories = from c in db.Categorys select c;
            ViewBag.cate = allCategories;

            Book book = db.Books.Find(id);
            if (book == null)
            {
                return HttpNotFound();
            }
            return View(book);
        }