how to delete css javascript file from browser cache from codebehind.

you can't clear the browser cache form the code behind. code behind files are executed on the server side. (Assuming your project is ASP.NET). And also, as far as I know, you can't clear browser cache using client side script such as javscript etc..

you can clear the application cache pragmatically.

$('.button').click(function() {
    $.ajax({
        url: "",
        context: document.body,
        success: function(s,x){

        $('html[manifest=saveappoffline.appcache]').attr('content', '');

            $(this).html(s);
    }
});
});

or you have to disable the cache control

<meta http-equiv='cache-control' content='no-cache'>
<meta http-equiv='expires' content='0'>
<meta http-equiv='pragma' content='no-cache'>

or you have to load your files(css/images/script) as following like way

/style.css?modified=20130116044521

?modified=20130116044521 is a dynamic parameter just like current-time-stamp

Application cache
http://www.html5rocks.com/en/tutorials/appcache/beginner/[^]

please check the following link for more caching information
http://www.mnot.net/cache_docs/[^]