public ActionResult Index(String search, int page = 1)
        {
            var rols = (byte[])Session["rols"];

            if (rols == null) //redirect to SinIn
            {
                return(RedirectToAction("Index", "Home"));
            }
            else if (rols.Contains <byte>(2) || rols.Contains <byte>(1))
            {
                IEnumerable <data.product> listProducts = null;

                if (search == "" || search == null)
                {
                    listProducts = _products.GetAll();
                }
                else
                {
                    listProducts = _products.GetByNameOrId(search);
                }

                ViewBag.Search = search;

                PagedList <data.product> model = new PagedList <data.product>(listProducts, page, 8);
                return(View(model));
            }
            else//redirect to Home
            {
                return(RedirectToAction("Home", "Home"));
            }
        }