Display loading image while PostBack calls in ASPNet

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ASP.NET

Javascript

jQuery

Hello all,
I followed this article to show loading image while the grid loads.
Display loading image while PostBack calls in ASP.Net[^]

I have two buttons on my page . one is for loading the grid and the other is for downloading the records in csv format.

It works fine for the loading part. but if i download it continues to show me the loading image. what should i do to get rid of this ??

this is the function. As you can see on form submitt showprogress function is called. but for download the loading image dosen't disappear as is the case with filling grid.

function ShowProgress() {
        setTimeout(function () {
            var modal = $('<div />');
            modal.addClass("modal");
            $('body').append(modal);
            var loading = $(".loading");
            loading.show();
            var top = Math.max($(window).height() / 2 - loading[0].offsetHeight / 2, 0);
            var left = Math.max($(window).width() / 2 - loading[0].offsetWidth / 2, 0);
            loading.css({ top: top, left: left });
        }, 200);
    }
    $('form').live("submit", function () {
        ShowProgress();
    });