ASP.NET - Overriding Javascript and Styleheets cached by browser

Question

I'm working on an asp.net website. I need to make sure my javascript and css updates will be immediately available for returning visitors, without them having to clear their cache to get the latest code. How can I force this when needed, and leave it alone on other occasions?

Thanks in advance.

Answer 1

Stackoverflow does this very elegantly IMO. You can see in there source there is a query-string variable passed.

<script type="text/javascript" src="http://sstatic.net/js/stub.js?v=778aaf5a38e2"></script>

This will force new load if that changes.