public ActionResult Cart(CartViewModel cartViewModel)
        {
            OrderDto order = (OrderDto)HttpContext.Session["CurrentOrder"];

            vm.ProductList           = ConvertToDTO(productService.RetriveProductList());
            cartViewModel.Selectlist = PopulateList();
            SelectListItem selected = null;

            if (cartViewModel.ProductPrice != null)
            {
                selected = cartViewModel.Selectlist.Find
                               (m => m.Value == cartViewModel.ProductPrice.ToString());
            }
            if (selected != null)
            {
                selected.Selected     = true;
                cartViewModel.Message = "Product : " + selected.Text +
                                        " Price : " + selected.Value + " Quantity : " + cartViewModel.Quantity;
                if (cartViewModel.Quantity != 0 && selected.Text != "Please select")
                {
                    var product    = productService.GetProduct(selected.Text);
                    var productDto = ConvertToDTO(product);
                    order.AddLineItem(new LineItemDto
                                          (productDto,
                                          cartViewModel.Quantity), order.LineItemList);
                }
            }
            cartViewModel.LineItemList          = order.LineItemList;
            HttpContext.Session["CurrentOrder"] = order;
            return(View(cartViewModel));
        }