Ajax controls not working when URL Routing applied

 void RegisterRoute(RouteCollection routes)
{

routes.MapPageRoute("myapp", "{name}", "~/search.aspx");
}

 void Application_Start(object sender, EventArgs e)
{
RegisterRoute(RouteTable.Routes);
}

<system.webserver>
<modules runallmanagedmodulesforallrequests="true">

</modules></system.webserver>