public ActionResult DetailProduct(int ProductID) { ProductListViewModel model = new ProductListViewModel(); model.ProductDetail = dac.DetailProduct(ProductID); List <ProductList> ForwardBom = dac.ProductBOM(true, ProductID); List <ProductList> ReverseBom = dac.ProductBOM(false, ProductID); if (ForwardBom != null) { model.ForwardBom = ForwardBom; } else { model.ForwardBom = NullList; } if (ReverseBom != null) { model.ReverseBom = ReverseBom; } else { model.ReverseBom = NullList; } return(View(model)); }