Kentico12-TipsTricks-Structure-ProductsController.cs

public class ProductsController : Controller
{
    private readonly IProductsQuery productsQuery;
    private readonly IProductDetailQuery productDetailQuery;

    public ProductsController(
        IProductsQuery productsQuery,
        IProductDetailQuery productDetailQuery)
    {
        // ...
    }

    [HttpGet]
    public ActionResult Index() => 
        View(new ProductIndexViewModel(productsQuery.Execute()));

    [HttpGet]
    public ActionResult Detail(int productId)
    {
        var product = productDetailQuery.Execute(productId);

        return product is null
            ? new HttpNotFoundResult($"Product with Id {productId}")
            : View(new ProductDetailViewModel(product));
    }
}