Getting number of instances of asp.net website

I have an asp.net website and i want to get the number of users currently viewing my s开发者_运维技巧ite. I am aware that there are some third party softwares available, that would give me the list of the users online but i don't want to do that.

Does anyone know how this can be achieved in asp.net? May be if there are any server variables that would keep a track of the website instances that gives the number of users currently visiting the site. Please help me.

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if you want to count users which are using your website at the moment you can use the following code in your global.asax file:

private int activeUsers = 0; 
protected void Session_Start(Object sender, EventArgs e) 
{ 
   activeUsers++; 
   Context.Items["activeUsers"] = activeUsers; 
} 
protected void Application_BeginRequest(Object sender, EventArgs e) 
{ 
   Context.Items.Add("activeUsers", activeUsers); 
} 
protected void Session_End(Object sender, EventArgs e) 
{ 
   if(activeUsers > 0) 
   activeUsers--; 
} 
protected void Application_End(Object sender, EventArgs e) 
{ 
   activeUsers = 0; 
}

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I would use performance counters instead.

Look under ASP.NET Application Performance Counters

http://msdn.microsoft.com/en-us/library/fxk122b4.aspx