Session expire on popup aspx page

I have query over session expire on popup aspx page.

I have asp.net project where session expire funtionality is working. now i have add one new aspx that will open as popup on certain

event on the login page after sign-in process.

Now question is session expire funtionality will also work for the popup aspx page as it inherit same namespaceOR

we need to implement some thing else for this

Thanks