Url Routing For The Page Inside A Folder?

I am trying to implement Url routing in asp.net 4.0. I just a created a small test application. I am trying to browse the pages kept inside the folder. It works fine when i am running in Visual studio..but when i hosted the application in IIS7 then it showed an error.

HTTP Error 404.0 - Not Found

The resource you are looking for has been removed, had its name changed, or is temporarily unavailable.

The code i used is. (i am using master page too.)

protected void Application_Start(object sender, EventArgs e)
{
CustomRouteTable(RouteTable.Routes);
}
void CustomRouteTable(RouteCollection routes)
{
routes.MapPageRoute("Telugu", "Movie/Telugu", "~/Telugu/Telugu.aspx");
}

in my default.aspx page i kept a button and on click of the button i wrote.

protected void btnTelugu_Click(object sender, ImageClickEventArgs e)
{
Response.RedirectToRoute("Telugu");
}