How to enumerate the person online in Asp.Net

 public static int count = 0;
  void Application_Start(object sender, EventArgs e) 
  {
    Application["myCount"] = count;
  }

  void Session_Start(object sender, EventArgs e) 
  {
    count = Convert.ToInt32(Application["myCount"]);
    Application["myCount"] = count + 1;
  }

Now every time when visitor open your site the variable count will be increased by one.

To Get the total at you home page you can write it as:

int a;
a = Convert.ToInt32(Application["myCount"]);

hope this help you