Want to show only query string in url routing asp.net

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ASP.NET4

i want to rewrite the url with query string. here is the example

e.g

www.test.com/user.aspx?Name=1234

i want to rewrite like

www.test.com/1234

it is working fine with www.test.com?Name=1234 to www.test.com/test/1234

i am doing like ..

void Application_Start(object sender, EventArgs e)
    {
        // Code that runs on application startup
        RouteTable.Routes.MapPageRoute("StoreRoute",
        "{Name}",
        "~/Webpages/Test/Demo.aspx");

    }

Thanx in Advance