How to find number of online user/visitors in asp.net

Hi.

In this article i am going to describe about to find the number of online user in website. This type of process we have to write the code in

Global.asax file .In previously i wrote an article about to find number of views or count in page .For your reference i mention it here...

http://vbdotnetaddict.blogspot.com/2011/02/application-sessioncache-and-cookies-in.html

Global.asax file you can find in Solution explorer. Click Solution explorer->ADD New Item->Choose Global.asax file

In this file you Can find the following Structure:

Application start, Application End, session start ,session end Function ,So write the below code in the file

<script runat="server">

    Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)

        ' Code that runs on application startup

        Application("user") = 0

    End Sub

   

    Sub Application_End(ByVal sender As Object, ByVal e As EventArgs)

        ' Code that runs on application shutdown

    End Sub

       

    Sub Application_Error(ByVal sender As Object, ByVal e As EventArgs)

        ' Code that runs when an unhandled error occurs

    End Sub

    Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)

        ' Code that runs when a new session is started

        Application.Lock()  ' Its used to open only one time  for session,suppose the user do referesh page  it will not count the counter.

        Application("user") = Application("user") + 1

        Application.UnLock()

               

    End Sub

    Sub Session_End(ByVal sender As Object, ByVal e As EventArgs)

        ' 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.

        Application.Lock() ' Its used to open only one time  for session,suppose the user do referesh page  it will not count the counter.

        Application("user") = Application("user") - 1

        Application.UnLock()

       

    End Sub

      

</script>

Also Find web.config file in that file write the below code in session.

Session is used when user went offline then its decrease one count from the application ("user").

                <system.web>

                                <sessionState mode="InProc" timeout="5"/>

                             

                                <compilation debug="true">

Then In your Homepage i.e default.aspx file keep one label and the enter the following code in serverside

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

          Label1.Text = Application("user")

    End Sub

Now process is over,  you can open your page check the page in different browser it will count the online user..

i hope this one helpful to you ..