how to re-write url of two detals pages in asp.net

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ASP.NET

VS2010

1 page is product details page
2 All products according to brands

I am using url rewrite in global.aspx by which one one page is working
my code is

void Application_Start(object sender, EventArgs e)
   {
      RegisterRoutes(RouteTable.Routes);
      RegisterRoutes1(RouteTable.Routes);
      Application["k"] = 0;
   }

   static void RegisterRoutes(RouteCollection routes)
   {
       routes.MapPageRoute("Product_detail", "{Name}/{id}.html", "~/Products/Product_detail.aspx");
      

   }

void Session_Start(object sender, EventArgs e)
    {
        // Code that runs when a new session is started
        Application.Lock();
        Application["v"] = ((int)Application["k"] + 1);

        Application.UnLock();

    }