To get the recent user number in ASP.Net using c# follow the below steps.

  1. Add a Global.asax page, Global.asax is a page containg session level and application level events, this is also called an application file.

    Write the below code in to your Global.asax page

     <%@ Application Language="C#" %>
    <script runat="server">
     public static int u_count = 0;
     void Application_Start(object sender, EventArgs e)
    {
     // Code that runs on application startup
     Application["user_Count"] = u_count;
    }
    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
    }
    void Session_Start(object sender, EventArgs e)
    {
     // Code that runs when a new session is started
     u_count = Convert.ToInt32(Application["user_Count"]); Application["user_Count"] = u_count + 1;
    }
    void Session_End(object sender, EventArgs e)
    {
     // Code that runs when a session ends.
    // Note: The Session_End event is raised only when the sessionstate mode
     // is set to InProc in the Web.config file. If session mode is set to StateServer
    // or SQLServer, the event is not raised.
    }
     </script>

    In above code “u_count “ ll start from zero but as it goes on the “user_count” and “u_count” ll increase one and ll hold the value “1”.
  2. Write the below code in to code behind page or .cs file

    using System;

    using System.Collections.Generic;

    using System.Linq;

    using System.Web;

    using System.Web.UI;

    using System.Web.UI.WebControls;

    using System.Globalization;

    public partial class Default2 : System.Web.UI.Page

    {

    protected void Page_Load(object sender, EventArgs e)

    {

    int a;

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

    Label1.Text = Convert.ToString(a);

    if (a < 10)

    Label1.Text = "000" + Label1.Text;

    else if (a < 100)

    Label1.Text = "00" + Label1.Text;

    else if (a < 1000)

    Label1.Text = "0" + Label1.Text;
    }
     }

Output

Clipboard02.jpg