The top bar of my website contains a counter to track the number of current visitors on the site. It is very simple to implement. Start by opening your Global.asax.cs file.

1) Add a private int variable named m_ActiveUsers
2) Add a public int property named ActiveUsers
3) In the Application_Start function, initialize m_ActiveUsers
4) In the Session_Start function add 1 to the counter
5) In the Session_End function subtract 1 from the counter

public class Global : System.Web.HttpApplication
{
  protected static int m_ActiveUsers;
  public static int ActiveUsers
  {
   get { return m_ActiveUsers; }
  }
  protected void Application_Start(Object sender, EventArgs e)
  {
   Application.Lock();
   m_ActiveUsers = 0;
   Application.UnLock();
  }
  protected void Session_Start(Object sender, EventArgs e)
  {
   Application.Lock();        
   ++m_ActiveUsers;
   Application.UnLock();         
  }
  protected void Session_End(Object sender, EventArgs e)
  {
   Application.Lock();        
   --m_ActiveUsers;
   Application.UnLock();         
  }

6) In your .aspx page include a label called Visitors
7) In your .aspx.cs Page_Load function include the following line:

Visitors.Text = Global.ActiveUsers.ToString();

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