Introduction
Here I will explain how to count number of online users
of website in asp.net using C#
and VB.NET or how to get number of online visitors of website
in asp.net using C#
and VB.NET.
Description
In previous articles I explained get count of visitors website in asp.net, jQuery cascading dropdown list example in asp.net, jQuery show progressbar in button click in asp.net, Asp.net Interview questions, Joins in SQL Server and many articles relating to Gridview,
SQL, jQuery,asp.net,
C#,VB.NET.
Now I will explain how to count number of online visitors of website in asp.net
using C# and VB.NET.
To get number of online visitors for
website we need to use methods in Global.asax
file for that first add Global.asax
file in your application
Open Visual Studio -à Create New Website
-à Right click on
Solution Explorer -à Select Add New Item
-à Select Global
Application Class file and click OK
Now open Global.asax file and write the code like as shown below
Global.aspx
<%@ Application Language="C#"
%>
<script runat="server">
void Application_Start(object
sender, EventArgs e)
{
// Code that runs on application
startup
Application["OnlineVisitors"]
= 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
}
void Session_Start(object
sender, EventArgs e)
{
// Code that runs when a new
session is started
Application.Lock();
Application["OnlineVisitors"]
= (int)Application["OnlineVisitors"]
+ 1;
Application.UnLock();
}
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.
Application.Lock();
Application["OnlineVisitors"]
= (int)Application["OnlineVisitors"]
- 1;
Application.UnLock();
}
</script>
|
In above code Application_Start event will raise only once when application starts
and Session_Start event will raise for every postback operation and Session_End event is used to reduce count of users when session
ends. If you want to know more about it check this What
is Global.asax file and uses of it
Here Session_End event will work only when we set sessionstate mode
to InProc in web.config file for that reason we need write code in web.config file as shown below
<system.web>
<sessionState mode="InProc" cookieless="false" timeout="20"/>
</system.web>
|
Now open your aspx page and write
the following code
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1"
runat="server">
<title></title>
</head>
<body>
<form id="form1"
runat="server">
<table>
<tr>
<td>
<b>No
of Users Online:</b>
</td>
<td style="color:Red">
<%=Application["OnlineVisitors"].ToString()%>
</td>
</tr>
</table>
</form>
</body>
</html>
|
Demo
 |
Download Sample Code Attached
Note: We need to remember
that session will not expire when we close browser it will expires after 20
minutes of default time or forcefully clear session by using Session.Abandon()
|
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14 comments :
Nice Upload Suresh
very useful informations....superbly maintaining...Thanks..
Great article. Thanks.
Please make it "global.asax" in the heading as that may misguide beginners.
Regards
I have tried this before for ending the session i even tried session.abandon() and session.remove(" "). but it never worked.
The main limitation in using this is that, what happens the user just closes the browser without ending the session ? or the browser crashes ? Then the online visitors will be the same until the session automatically times out right ?
Anyway good try though..!!
can we do in the MVC also? i tried with this <%=Application["OnlineVisitors"].ToString()%> in view its not working. i m waiting for your favorable response .
nice article...very useful
nice and so simple.... Thanks for information.
thank you for your valuable information. and then i am expecting more information from your side... thank you thank you so much
I Want to provide access a particular page only four people can access at the same time
Thanks a lot buddy...
Thanks Suresh...this code Working fine...
if you are using MVC try to fetch response in model or view-model then bind that with respective layout or view
like this Online Users:
@Model.countUsersLoggedIn
If User logout or session Abondon the count is not decreasing.
nice article...very useful
But can you please give some idea to handle browser close scenario without log off.
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