Session checking in asp.net - asp.net

Question

I was assigned to a older project been done in asp webforms. So in every page load I found code like
if (HttpContext.Current.Session["UserDetails"] != null)
For checking if session is active for visiting the page. Is there any single point where I can write this code so that if user is inactive loginPage is presented.

Answer 1

Maybe you could achieve your task with a HTTPModule:
Example from MSDN
using System;
using System.Web;
public class HelloWorldModule : IHttpModule
{
public HelloWorldModule()
{
}
public String ModuleName
{
get { return "HelloWorldModule"; }
}
// In the Init function, register for HttpApplication
// events by adding your handlers.
public void Init(HttpApplication application)
{
application.BeginRequest +=
(new EventHandler(this.Application_BeginRequest));
application.EndRequest +=
(new EventHandler(this.Application_EndRequest));
}
private void Application_BeginRequest(Object source,
EventArgs e)
{
// Create HttpApplication and HttpContext objects to access
// request and response properties.
HttpApplication application = (HttpApplication)source;
HttpContext context = application.Context;
string filePath = context.Request.FilePath;
string fileExtension =
VirtualPathUtility.GetExtension(filePath);
if (fileExtension.Equals(".aspx"))
{
// test here your session
}
}
private void Application_EndRequest(Object source, EventArgs e)
{
}
public void Dispose() { }
}
You should register this module in your web.config:
<configuration>
<system.webServer>
<modules>
<add name="HelloWorldModule" type="HelloWorldModule"/>
</modules>
</system.webServer>
</configuration>

Answer 2

If you have controller page, how about this way?
Controller page.
[SessionExpireFilter]
public void functionname()
{
//you're function region page?
}
New createpage.
public class SessionExpireFilterAttribute : ActionFilterAttribute
{
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
HttpContext ctx = HttpContext.Current;
if (HttpContext.Current.Session["UserDetails"] == null)
{
filterContext.Result = new RedirectResult("~/Login");
return;
}
base.OnActionExecuting(filterContext);
}
}