public ActionResult Detail(int ID)
{
Book book = BookAction.FindBook(ID);
if (Session["UserName"] != null)
{
int id_account = (int)Session["UserID"];
BookAction.Watched(id_account, ID);
}
else
{
BookAction.Watched(null, ID);
}
ViewBag.Book = book;
ViewBag.ListBook = BookAction.ListBook();
return(View());
}