public async Task <ActionResult> AddItemJson(string id, int quantity = 1)
{
await _cartBuilder.GetOrCreateNewTransientCartAsync(WorkContext.CurrentStore, WorkContext.CurrentCustomer, WorkContext.CurrentLanguage, WorkContext.CurrentCurrency);
var product = await _catalogService.GetProductAsync(id, Model.Catalog.ItemResponseGroup.ItemLarge);
if (product != null)
{
await _cartBuilder.AddItemAsync(product, quantity);
await _cartBuilder.SaveAsync();
}
return(Json(null, JsonRequestBehavior.AllowGet));
}