BACKGROUND
Using VS2005, VB code behind, UpdatePanels and the AJAX control toolkit v1.0.61025.0,I have a fairly complex master/content page with a few UpdatePanels. In UpdatePanel1 I have several input controls. Based on the input of one TextBox I need to show/hide other controls - so onblur of the TextBox I run some javascript to click a hidden button (that is also inside UpdatePanel1) then on the server side I interrogate the TextBox value and show/hide controls as needed. This works well as the button gets clicked as expected. The hidden button has its CausesValidation value set to "False" in hopes that no validation would be executed. All validators in UpdatePanel1 and a ValidationSummary control have their ValidationGroup value set to "Group1".
Another UpdatePanel (i.e. UpdatePanel2) on the page is wrapped inside a ModalPopupExtender. UpdatePanel2 also contains inpu ...
Go to the complete details ...