Get List and Number of Online users

First create website and add Registe , Login and WhoIsOnline page in website

In OnlineUser page add lable (lblSessionCount) and Gridview (OnlineUserList) control which is bound to
(UserName (BoundField), IsOnline (CheckBoxField) , Email (BoundField) )


Im WhoIsOnLine.aspx.cs page add

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class WhoIsOnLine : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
//if (!IsPostBack)
//{
MembershipUserCollection OnlineUsers = new MembershipUserCollection();
MembershipUserCollection AllUsers = new MembershipUserCollection();
AllUsers = Membership.GetAllUsers();

foreach (MembershipUser user in AllUsers)
{
if (user.IsOnline)
{
OnlineUsers.Add(user);

}
}
int OnlineUserCount = OnlineUsers.Count;

lblSessionCount.Text = OnlineUserCount.ToString();
OnlineUserList.DataSource = OnlineUsers;
OnlineUserList.DataBind();
//}
}
}