BookManagement.Controllers.BookController.Detail C# (CSharp) Метод

        public ActionResult Detail(int id = 0)
        {
            ViewBag.Id = id;
            //Book
            ViewBookModel viewBook = new ViewBookModel();
            viewBook.Books = db.Books.Find(id);

            //Categories
            viewBook.Categories = db.Categorys.Where(p => p.CategoryID == viewBook.Books.CategoryID).First();

            //
            viewBook.Books.CountVistor += 1;
            db.Books.Attach(viewBook.Books);
            var entry = db.Entry(viewBook.Books);
            entry.Property(e => e.CountVistor).IsModified = true;

            // other changed properties
            db.SaveChanges();

            if (viewBook == null)
            {
                return HttpNotFound();
            }
            return View(viewBook);
        }