public ActionResult Index()
        {
            string             username        = SessionHelper.GetUserSession();
            List <CartSession> cartsessionlist = null;

            if (username != null)
            {
                if (SessionHelper.GetCartSession(username) == null)
                {
                    return(PartialView(cartsessionlist));
                }
                else
                {
                    cartsessionlist  = SessionHelper.GetCartSession(username);
                    ViewBag.summoney = code.Summoney(cartsessionlist);
                    return(PartialView(cartsessionlist));
                }
            }
            else
            {
                if (SessionHelper.GetCartSession("cart") == null)
                {
                    ViewBag.summoney = 0;
                    return(PartialView(cartsessionlist));
                }
                else
                {
                    cartsessionlist  = SessionHelper.GetCartSession("cart");
                    ViewBag.summoney = code.Summoney(cartsessionlist);
                    return(PartialView(cartsessionlist));
                }
            }
        }