public static void RegisterRoutes(RouteCollection routes)
{
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.RedirectLegacyUrl("Page1.aspx", "~/qstring");
routes.MapRoute("QStringUrl", "qstring", new {controller = "Qstring", action = "Index"});
routes.MapRoute(
"Default", // Route name
"{controller}/{action}/{id}", // URL with parameters
new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
);
}