.NET Core Web Application - Use of Route attribute

SampleController.cs

// Route attribute can also be placed on controller
public class SampleController : Controller
{
    [Route("/")]
    [Route("Sample")]
    [Route("Sample/Index")]
    [Route("Sample/Index/{id?}")]
    public ActionResult Index()
    {
        return View();
    }

    [Route("Sample/Details")]
    [Route("Sample/Details/{id?}")]
    public ActionResult Details(int id)
    {
        return View();
    }
}