This article shows how:
http://www.codeproject.com/Articles/37868/Beginners-Introduction-To-XSL-Transform-Rendering-XML-Data-using-XSL-Get-HTML-output.aspx
here's another link that shows how, perhaps a bit more simply
http://www.aspfree.com/c/a/XML/Applying-XSLT-to-XML-Using-ASP.NET/2/