If you deployed an ASP.NET application in a web form and you would like to find the total number of user sessions in that web application. You can use the following code snippet to display current user sessions on the website in ASP.NET.

<%@ Page Language="vb" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
 Sub Page_Load()
lblSessionCount.Text = Application("SessionCount").ToString()
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
 <title>Show Session Count</title>
</head>
<body>
 <form id="form1" runat="server">
 <div>
 Total Application Sessions:
<asp:Label
 id="lblSessionCount"
 Runat="server" />
 </div>
 </form>
</body>
</html>

I hope this blog will help you.