How to get Session values in Global.asax?

Question

Hi,

   How to get Session values in Global.asax? 

 

My codes:

protected void Application_AuthenticateRequest(object sender, EventArgs e){

try

{

if (HttpContext.Current.Session["UserID"]!=null){  // Program error occurs here.

   // TO DO STH...

}

}

catch { } // Not logged in does not make.

}

 

Note: I need to do this: whenever the user touches a page to know the login ID.

 

 

Thanks.