The page goes through its full life-cycle on AJAX calls: http://encosia.com/2007/10/24/are-you-making-these-3-common-aspnet-ajax-mistakes/
. This means that a new RadCaptcha code will be generated but it would not be displayed on the image, since the RadCaptcha control is not updated by the AJAX call. Basically you would compare the old code with the new code and the user input will always be validated as wrong.
One more thing is that this would create additional load on the server because there would be an additional trip to the server just to validate the Captcha code.
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