How to use the ajax toolkit in asp.net? <p>Hi I have installed the AJAX Toolkit by following <a href="http://weblogs.asp.net/nannettethacker/archive/2008/02/07/ajax-control-tookit-installation-in-visual-web-developer.aspx" rel="nofollow">this</a> but I don't know how to use the controls of AJAX in ASP.Net. I tried <a href="http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/AjaxFileUpload/AjaxFileUpload.aspx" rel="nofollow">this</a> tutorial but this gave me some errors.</p>