validating any given condition on machine shutdown in c# dot net

Hi Experts,

Suppose I need to make sure creation of a file say abc.txt in a particular directory, in windows 7 OS, on machine shutdown.How do I check that? If file is created, allow shutdown, else do not shut down and give a message to user.
DevildibAsked:
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UnifiedISCommented:
In order to restrict the ability to shutdown, you'll have to (try to) stop the user from using conventional means. There are some local group policies that can make it more difficult to shutdown but nothing is 100% foolproof.
Once you limit the shutdown capability, you'll have to provide an interface for the user to shutdown.  This is where you can throw in any logic to decide to allow or deny the shutdown.
In case of a file needing to exist, simply leverage the io namespace to check for existence of the file (io.file.exists).
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DevildibAuthor Commented:
Is'nt there any programmatic approach to capture shut down button of system and write the file exist logic there itself?
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UnifiedISCommented:
It's possible, I don't know how to do that though.
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