The Timeout Handling Control can handle both the ASP.NET session timeout and the ASP.NET forms authentication timeout. It can be used on individual pages or it can be added to the master page to handle the timeout situation on all content pages. Both the warning that the page will expire soon and the explanation on the page that had expired are independent, highly configurable and can be individually styled.
The Timeout Handling Control is Ajax compatible although it does not require Ajax enabled Web site. The warning includes a countdown indicator that changes every second. Version 1.53 may include unspecified updates, enhancements, or bug fixes.