We have an Umbraco site with a member section that is protected using the Public Access mechanism, using role based membership. When a user's session times out, and the user tries to navigate to another protected page, Umbraco automatically serves the Login page.

We want to show a message (preferrably on this Login page) that shows that the user has been logged out due to a session timeout.

Is there any mechanism in Umbraco (or ASP.NET / MVC for that matter) that we can use to show such a message?