I am trying to use Rounting in ASP.NET 4.0 

This is my code:(global.asax file) 

    void Application_Start(object sender, EventArgs e) 
    {
        RegisterRoutes(System.Web.Routing.RouteTable.Routes);
    }
 
    void RegisterRoutes(System.Web.Routing.RouteCollection routes)
    {
 
        routes.MapPageRoute("recordingDemo", "recording.aspx", "~/About.aspx?sub=recordingdemo");
    }

In About.aspx: 

 if (Request.QueryString["sub"] != null)
 {
      switch (Request.QueryString["sub"].ToString())
      {
                    case "demo":
                        multiviewRecording.SetActiveView(viewDemo);
                        break;
      }
      ..........
}

The problem is that I don't have anymore querystring in About page. 

What I want to do is: on link recording.aspx(this page doesn't exists in my page) I want to open the page About.aspx?sub=recordingdemo 

It is possible to do something like this with Url Rounting?