title: asp.net redirect if maximum connections/sessions reached
body: <p>is there a way to redirect a user when there are n people/sessions on a site.  I have a requirement to redirect to a 'sorry we are busy, please try later' page if there are too many people currently engaging the site (this is to stop flooding a live business service that is behind the webpages).  The ideal is that only new users (users not already logged in) are shown this page.  I was going to just count concurrent logins but wondered if there was a better way to count current activity rather than login status being that most users might stay logged in for a while.</p>
  
  <p>thanks in advance.</p>