public JsonResult AddTocart(CartViewModel model)
        {
            var userId = Convert.ToInt32(HttpContext.Request.Cookies["user_id"]);

            if (userId == 0)
            {
                return(null);
            }
            try
            {
                if (ModelState.IsValid)
                {
                    List <ItemDto> items  = _IItem.getAllItem();
                    var            item   = items.Where(w => w.Id == model.ItemId).FirstOrDefault();
                    var            result = _IItem.AddTocart(new CartDto
                    {
                        ItemId       = model.ItemId,
                        Quantity     = model.Quantity,
                        UserId       = userId,
                        PricePerItem = Convert.ToInt32(item.Price)
                    });
                    return(Json(result.Id));
                }
            }
            catch
            {
                throw;
            }
            return(null);
        }