BookStore.Controllers.BookController.Edit C# (CSharp) Method

        public ActionResult Edit(int id = 0)
        {
            Book book = db.Books.Find(id);
            if (book == null)
            {
                return HttpNotFound();
            }
            ViewBag.CategoryID = new SelectList(db.Categorys, "CategoryID", "Name", book.CategoryID);
            return View(book);
        }