Check How Many User Logged In your web site using Application Variable

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Step: 1 First of all we will create the file Global.asax and write below code as:
<%@ Application Language="C#" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.Collections" %>
<script runat="server">

    void Application_Start(object sender, EventArgs e)
    {
        // Code that runs on application startup declare your initial value
        Application["LoggedInUser"] = 0;
    }
   
    void Application_End(object sender, EventArgs e)
    {
        //  Code that runs on application shutdown

    }

    void Application_Error(object sender, EventArgs e)
    {
        // Code that runs when an unhandled error occurs, this code will helps you to catch the exception when occured
           
        Exception ex = Server.GetLastError().GetBaseException();
        string exPage = HttpContext.Current.Request.Path;
System.IO.StreamWriter file = File.AppendText(Server.MapPath("~/Error.txt")); //Append files with new data..

        file.WriteLine("Error Occured on " + System.DateTime.Now.ToString());
        file.WriteLine("-------------------************************-------------------------------");
        file.WriteLine("Exception is as " + ex.Message);
        file.WriteLine("Exception page is " + exPage);
        file.WriteLine("-------------------************************-------------------------------");

        file.Dispose();
        file.Close();
    }
   
    void Session_Start(object sender, EventArgs e)
    {
  // Code that runs when a new session is started, when application starts it will check logged in User in application and increment the counter
        if (Application["LoggedInUser"] != null)
        {
            Application.Lock();
            Application["LoggedInUser"] =
            ((int)Application["LoggedInUser"]) + 1;
            Application.UnLock();
        }
    }

    void Session_End(object sender, EventArgs e)
    {
        // Code that runs when a session ends.
        if (Application["LoggedInUser"] != null)
        {
            Application.Lock();
            Application["LoggedInUser"] =
        ((int)Application["LoggedInUser"]) - 1;
            Application.UnLock();
        }
    }
      
</script>

Step: 2
Write Below code in your page I.e. Header or Footer on page load
   protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            //Check whether User Loged in on website and decrement the counter

            if (Application["LoggedInUser"] != null)
            {
                int LogedInUsers = ((int)Application["LoggedInUser"]);

                ltUserLogedInCount.Text = "There are " + LogedInUsers + " User(s) Loged In";
            }
        }
    }

Declare one Literal Control to get user count on .aspx page
Step: 3
Change Setting to Catch Exception in web.config to CustomErrors
<customErrors mode="On" defaultRedirect="Index.aspx">
           
</customErrors>

I hope you will enjoy the code.

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