Doing so can cause your application or the operating system to stop responding.
For more information, see the WM_KILLFOCUStopic, and the "Message Deadlocks" section of the About Messages and Message Queues topic.
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You can use the Tab Page’s Validating event to prevent a new tab page selection.
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? According to MSDN events happen in following order: Focus events occur in the following order: 1.. For this issue, I think there are 2 workarounds: 1.
The problem I am experiencing is when a control fails its validating event and the user clicks another tab things get messy. loop all the controls on the tabpage, then judge if each control is the default value(We suspect the default value is not the valid value), if it is the default value, does not allow the index change. You may add a custom validating type event for each tabpage, then when registering event handler for child control's Validating event, you should also register it for the tabpage custom event, then in Tab Control.
This example requires that a Text Box and Error Provider control have been created on a form.
Hello Thomas, When you give the Tab Control a Content Template and bind it to some collection of items, then switching between tabs makes the Tab Control unload the content of the last active item and load the content of the newly selected item.
You will also have to add some code like above when the Tab Control is shown the very first time (like in the Form_Load event handler).
2) Listen to the Tab Page’s Validating event (which will be called when the user clicks on a different tab page) and determine whether the user should be allowed to change the selected tab page.
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