Error Handling for AJAX Requests
Telerik did not implement custom error handling for RadAjax , because the Microsoft AJAX framework already takes care of that. During partial-page rendering, you can handle errors by doing the following:
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Set the AllowCustomErrorsRedirect property, which determines how the custom error section of the Web.config file is used when an error occurs during an asynchronous postback.
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Handle the ScriptManager control's AsyncPostBackError event, which is raised when there is a page error during an asynchronous postback.
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Set the AsyncPostBackErrorMessage property, which is the error message that is sent to the browser.
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Take advantage of the PageRequestManager class which enables you to handle events in the client page life cycle and to provide custom event handlers that are specific to partial-page updates.