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May i know is there any event similar to Deselecting event or any other property or function or some work around to achieve this functionality. This functionality can be achieved in Windows Tab Contro by using Deseleting event of Tab Control.Hi Dennis, Based on my understanding, you want to validating all the controls on the tabpage before switch pages.I think you should hook the Validating event for all the controls on your form.Event Args e) bool b_switch=false; private void button1_Click(object sender, System.Event Args e) Thank you for your patience and cooperation.Selected Tab This property returns or sets the currently selected tab page.You can use this property to programmatically change the current tab: Selected Index This property returns or sets the index of the currently selected tab page.

Selected Index Changed event, you can explicit invoke all the validating event handler, if not valid, then swith back to the orignal tabpage.

Thanks, Dennis Hi, Dennis did you try to hook Tab Page. Selected Index Changed event, you can explicit invoke all the validating event handler, if not valid, then swith back to the orignal tabpage.

Ideally, I think the best solution is not to leave a tab until the validating event has completed successfully. Being able to do that might help for my particular circumstances. If you have multi-tab entry form final validation should occur only when final tab page is filled and confirmed. I guess maybe I should have asked only how to prevent a user from leaving a tab page. I think you should hook the Validating event for all the controls on your form.

Note: Pressing Ctrl Tab will select the next Tab Page in the Tab Control.

Is there a way to prevent the user from leaving a tab on a Tab Control until all the controls on that tab have finished validating? Another approach would be to somehow cancel the pending validating event when the user selects another tab page. I can setup a tab page leave event, but to what benefit? According to MSDN events happen in following order: Focus events occur in the following order: 1.. I would allow user to fill pages in the order he/she prefers and jump between them at will. Being able to do that might help for my particular circumstances. For certain control, once it has focus, it will validate its data for closing, leaving, etc.. So the only problem when changing pages is when all the child controls on the form have no focus, then swith pages will not trigger the child controls' validating events.

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