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    1. CODo you mean spawn dialog invoked from custom action? I'm not sure how to display spawn dialog from custom action, also I'm not sure how to use BackgroundProcess class. Should I move network scanning stuff to background thread and exit thread afer user click cancel button? I know how to do this using winforms window, but I have no idea how to use wix spawn dialog in this case. Can you explain it a little more?
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    2. CONo, in this case I'm actually saying to handle the UI in .NET. Your first dialog will call DoAction YourCustomAction and your Custom Action will throw up a foreground modal dialog displaying progress and allowing cancel while allowing for cancelling of the operation. I find background process easy to use but if you know how to do it another way using threading that's fine also.
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    3. COOk, but as I know (correct me if I'm wrong), only way to display modal dialog during wix installation process is to use spawn dialog. Any kind of gui created directly using .net stuff (winformms for example) will be always modeless and it can even appear below installer window - this is not acceptable. So - to be clear: do you mean I should invoke standard .net dialog (winforms window) or some kind wix/msi dialog? In the first case - it seems to be impossible to make it modal, in the second case, I have no idea how to use that kind of dialog to interrupt my network scan thread
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