routes.MapRoute(
                "admin_user",                                              // Route name
                "admin/user/{action}/{id}",                           // URL with parameters
                new { controller = "Activities", action = "Index", p = "1" }  // Parameter defaults
            );routes.MapRoute(
                "admin",                                              // Route name
                "admin/{action}/{id}",                           // URL with parameters
                new { controller = "Activities", action = "Index", p = "1" }  // Parameter defaults
            );            routes.MapRoute(
                name: "Default",
                url: "{controller}/{action}/{id}",
                defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
            );