Hello
John,
Please check the following help article:
http://www.telerik.com/help/aspnet-ajax/xmlhttppanel-vs-radajaxpanel.html. RadXmlHttpPanel uses client callbacks and web services, which do not offer a ViewState and only a few of the page lifecycle events are raised.
Most probably the values of the
RadTextBox controls are lost because of the limitations mentioned above. I would suggest replacing the RadXmlHttpPanel with a RadAjaxPanel or an UpdatePanel and if the values of the text boxes are persisted to keep this change as in this case it would appear that performing a partial postback is more suitable.
Regards,
Slav
Telerik
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