RouteConfig.cs file

routes.MapRoute(
    name: "TridionPage",
    url: "{*PageUrl}",
    defaults: new { controller = "Page", action = "Page" }
);
routes.MapRoute(
   name: "Default",
   url: "{controller}/{action}/{id}",
   defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);


Global.ascx.cs

public class MvcApplication : System.Web.HttpApplication
{
    ILifetimeScope BuildContainer()
    {
        var builder = new ContainerBuilder();
        builder.RegisterControllers(typeof(MvcApplication).Assembly);
        builder.UseDD4T();
        return builder.Build();
    }
    protected void Application_Start()
    {
        var builder = BuildContainer();
        DependencyResolver.SetResolver(new AutofacDependencyResolver(builder));

        AreaRegistration.RegisterAllAreas();
        RouteConfig.RegisterRoutes(RouteTable.Routes);
    }
}

Page Controller File

public class PageController : TridionControllerBase
{
  public PageController(IPageFactory pageFactor,
                        IComponentPresentationFactory componentPresentationFactory,
                        ILogger logger,
                        IDD4TConfiguration configuration) :
    base(pageFactor, componentPresentationFactory, logger, configuration)
  {

      public override ActionResult Page(string url)
      {
        return base.Page(url);
      }
  }
}