Disable auto Friendly URLs in a Web Form project

You could also just set the AutoRedirect mode to Off. This kinda gives you the best of both worlds.

    public static class RouteConfig
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        var settings = new FriendlyUrlSettings();
        settings.AutoRedirectMode = RedirectMode.Off;
        routes.EnableFriendlyUrls(settings);
    }
}

In your solution, open RouteConfig.cs (in the App_Start directory) and comment out or remove this line

    routes.EnableFriendlyUrls();

After uninstalling the NUGET package and deleting all the dll you must clear the browser cache