public ActionResult LogOff()
        {
            SuperMarketDB storeDB   = new SuperMarketDB();
            var           cartItems = storeDB.Carts.Where(c => 1 == 1);

            foreach (var cartItem in cartItems)
            {
                storeDB.Carts.Remove(cartItem);
            }

            storeDB.SaveChanges();

            AuthenticationManager.SignOut(DefaultAuthenticationTypes.ApplicationCookie);
            return(RedirectToAction("Index", "Home"));
        }