public ActionResult AddItemsToCart(int productid)
        {
            using (RHASTOREEntities db = new RHASTOREEntities())
            {
                if (User.Identity.Name == "")
                {
                    return(RedirectToAction("Login", "Account"));
                }
                else
                {
                    var  currentuser_id = Convert.ToInt32(User.Identity.Name);//this is actually the unique user id,the name is misleading
                    var  product_id     = productid;
                    var  quantity       = 1;
                    Cart c = new Cart();

                    c.userid    = currentuser_id;
                    c.ProductId = product_id;
                    c.Quantity  = quantity;
                    db.Carts.Add(c);
                    db.SaveChanges();
                }


                return(RedirectToAction("Index"));
            }
        }