public JsonResult AddToCart(int productId, int qty = 0) { if ((qty > c_maxProductQty) || (qty <= 0)) { return(Json(new { success = false }, JsonRequestBehavior.AllowGet)); } ; var userId = Convert.ToInt32(Membership.GetUser().ProviderUserKey.ToString()); var order = m_facade.GetOrderByUserId(userId); var orderItem = m_facade.GetOrderItem(order.Id, productId); if (orderItem == null) { var product = m_facade.GetProductById(productId); m_facade.AddOrderItem(new OrderItem(order.Id, productId, qty, product.Name)); return(Json(new { success = true }, JsonRequestBehavior.AllowGet)); } var newQty = orderItem.Qty + qty; if (newQty > c_maxProductQty) { newQty = c_maxProductQty; } orderItem.Qty = newQty; var orderItemUpdated = orderItem; m_facade.UpdateOrderItem(orderItemUpdated); return(Json(new { success = true }, JsonRequestBehavior.AllowGet)); }