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

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    Telerik Admin
    Telerik Admin avatar
    1679 posts
    Member since:
    Oct 2004

    Posted 15 Jul 2008 Link to this post


    RadControls version

    RadControls for ASP.NET AJAX

    .NET version


    Visual Studio version


    programming language


    browser support

    all browsers supported by RadControls

    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.
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