public ActionResult SuaQuangCao(QuangCaoViewModel model, int id, HttpPostedFileBase file, string img)
 {
     try
     {
         ShopEntities shop = new ShopEntities();
         var          qc   = shop.QuangCaos.SingleOrDefault(c => c.Id == id);
         file = file ?? Request.Files["file"];
         if (file != null && file.ContentLength > 0)
         {
             var fileName = Path.GetFileName(file.FileName);
             if (fileName != null)
             {
                 var path = Path.Combine(Server.MapPath("~/Images/QuangCao/"), fileName);
                 file.SaveAs(path);
                 qc.LinkQuangCao = model.QuangCao.LinkQuangCao;
                 qc.AnhDaiDien   = "/Images/QuangCao/" + fileName;
                 qc.MoTa         = model.QuangCao.MoTa;
                 shop.SaveChanges();
             }
         }
         else
         {
             qc.LinkQuangCao = model.QuangCao.LinkQuangCao;
             qc.AnhDaiDien   = img;
             qc.MoTa         = model.QuangCao.MoTa;
             shop.SaveChanges();
         }
         var data = new QuangCaoViewModel()
         {
             DanhSachQuangCaos = shop.QuangCaos.ToList()
         };
         return(View("QuangCao", data));
     }
     catch (Exception)
     {
         return(RedirectToAction("Slide"));
     }
 }
 public ActionResult QuangCao()
 {
     if (Session["MaTKAdmin"] == null)
     {
         return(RedirectToAction("Login", "Admin"));
     }
     else
     {
         try
         {
             ShopEntities shop  = new ShopEntities();
             var          model = new QuangCaoViewModel()
             {
                 DanhSachQuangCaos = shop.QuangCaos.ToList()
             };
             return(View(model));
         }
         catch (Exception)
         {
             return(RedirectToAction("Slide"));
         }
     }
 }