// GET: Admin/Content
public ActionResult Index(string searchString, int page = 1, int pageSize = 10)
{
var dao = new ContentDao();
var model = dao.ListAllPage(searchString, page, pageSize);
ViewBag.SearchString = searchString;//de giu lai gia tri search, ViewBag gui gia tri tu controllor xuong view
return(View(model));
}