title: how to Get Number Of Users Online for each role using ASP.NET
body: <p>I would like to know the number of users logged for each role into my ASP.NET application 
  i have an (Admin) role and the (rest) role
  i want to know the Number Of Users Online for each one not the entire application what this method did : </p>
  
  <pre><code>Membership.GetNumberOfUsersOnline()
  </code></pre>