VS2008: not able to cancel tabpanel validating event

Winforms, VS2008

Hi,

I have a mainform that has 2 usercontrols: UC1 and UC2.

UC1 has a treeview with treenodes. UC2 has tabControl with few tabPages. Selecting different nodes displays different details view in the TabControl's TabPages.

What I need is canceling the event when the user has selected a node in the treeview, then he selects another node (i want to be able to cancel this last event:selecting another node, all depending on a certain logic)

I mean: When the user is working on a tabpage in the tabControl, when he clicks on a different node in treeview (different from the currently selected node), before displaying the new node's details in the TabControl, I perform some logic, then depending on that logic, I set

e.cancel = true in the UC2 Validating event handler. (Rememebr UC2 includes the TabControl and the user, supposedly, has the focus on a control somewhere in TabControl)

But mysteriously, the event gets never canceled and the user still moves to the next node, displaying its details in the TabControl, although I set e.cancel = true.

Any idea, how I can solve this mystery please?

Thanks a lot.

You'd handle the TreeView.BeforeSelect event of the treeview in UC1 and do you validation there. If the validation fails, you cancel the event.

Quote:

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Originally Posted by stanav

You'd handle the TreeView.BeforeSelect event of the treeview in UC1 and do you validation there. If the validation fails, you cancel the event.

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But the validation logic i do is in the other user control UC2 in TabControl :(

Regardless where you perform your validation logic, if you want to stop the user from selecting a different treenode, you need to handle that treeview.beforeselect event so that you can catch when the user is trying to select a different treenode. There's no workarounds. Having said that, If you must perform the validation in UC2 where the TabControl is (which I find a little odd), you can always pass a reference of the treeview in UC1 to UC2 and handle the event there.

Quote:

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Originally Posted by stanav

Regardless where you perform your validation logic, if you want to stop the user from selecting a different treenode, you need to handle that treeview.beforeselect event so that you can catch when the user is trying to select a different treenode. There's no workarounds. Having said that, If you must perform the validation in UC2 where the TabControl is (which I find a little odd), you can always pass a reference of the treeview in UC1 to UC2 and handle the event there.

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Great thank you very much, I did that and it's working.

Tell me pls, will there be a way to cancel the event of the user clicking somewhere outside the UC2 by using a logic in UC2. I mean whether he clicks on the treeview, or anywhere else on the form, or do I have to do that on each event seperately?

Thanks :)