Handling the AjaxUpdate event of RadToolTipManager after the Session has expired when using Forms Authentication

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Answer

1572 posts

Member since:
Oct 2004

Posted 15 Jul 2008 Link to this post

Requirements
RadControls version	RadControls for ASP.NET AJAX
.NET version	2.x
Visual Studio version	2005
programming language	C#
browser support	all browsers supported by RadControls

PROJECT DESCRIPTION
When using Forms Authentication, triggering the AjaxUpdate event of the RadToolTipManager after the session expires, leads to "Sys.WebForms.PageRequestManagerServerErrorException" error. The problem lies in the MS AJAX architecture, and goes in direct conflict with Forms Authentication, because the Forms Authentication relies on redirecting to a new page, while UpdatePanels are designed to do partial page updates and "expect" to receive partial HTML.

The solution demonstrated in this code library uses a WebService to check whether the Session has expired, before the RadToolTip shows and triggers the callback that is to fetch its content from the server. Steps to follow:
1. Create a web service with the [ScriptService] attribute.
2. Define an IsLoggedIn method that checks whether the user is still logged in.
3. Add a ServiceReference within the ScriptManager (RadScriptManager) pointing to the web service.
4. In the OnClientBeforeShow event of the RadToolTipManager, invoke the IsLoggedIn web method - in case the user is not logged in, reload the entire page.
5. Add in the web.config file an AJAX HTTP Handler for .asmx files.