title: Get IIS User Before Impersonate And After Impersonate in ASP.NET Behind Code
body: <p>I use impersonate in my site, and I need to log each request to site, so need the username also, I think we can get this in server variables, but both <code>Auth_User</code> And <code>LogOn_User</code> return empty string. How can I get the username before impersonate and after impersonate? does any one have any ideas?</p>