On Jquery 2.1 ajaxStart is not firing

On Jquery 2.1 ajaxStart is not firing

I have a ASP.NET MVC 4 where I've used Jquery 1.8.2 and

on many pages I use Ajax and I have add this source toi show a wait image when Ajax is running ..

    <script type="text/javascript">
        $(function () {
            $("#busydiv").ajaxStart(function () {
                $(this).show();
            }).ajaxStop(function () {
                $(this).hide();
            });
        });
    </script>

Now I use Jquery 2.1.0 and this not run... 

Any suggests ?