ASP.NET: URL Rewriting в .NET 4

<%@ Application Language="C#" %>  
 <script runat="server">
     void Application_Start(object sender, EventArgs e) 
     {
 	//  Code that runs on application start
     }
  
     void Application_End(object sender, EventArgs e) 
     {
         //  Code that runs on application shutdown
  
     }
         
     void Application_Error(object sender, EventArgs e) 
     { 
         // Code that runs when an unhandled error occurs
  
     }
  
     void Session_Start(object sender, EventArgs e) 
     {
         // Code that runs when a new session is started
  
     }
  
     void Session_End(object sender, EventArgs e) 
     {
         // Code that runs when a session ends. 
         // Note: The Session_End event is raised only when the sessionstate mode
         // is set to InProc in the Web.config file. If session mode is set to StateServer 
         // or SQLServer, the event is not raised.
  
     }
        
 </script>

System.Web.Routing.RouteTable.Routes.MapPageRoute("sampleRoute1", "page", "~/page.aspx"); 

System.Web.Routing.RouteTable.Routes.MapPageRoute("sampleRoute2", "page/{par1}/{par2}", "~/page.aspx"); 

object par1 = Page.RouteData.Values["par1"];