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C# - How to Count Number of Online Users in Asp.Net Using C#, VB.NET

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 addGlobal.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_Startevent 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


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