Capture event c#

Hi,
Is it possible to capture event and trigger action? On closing document, message box say "Bye".
Can I do it using SDK with c# if yes then please guide me how. If NO then  let me know how it can be possible.
Thanks

Please tell me more which C++ based plugin I can use?
I can embed javascript with pdf using c#(like app.alert). But I cannot find example of capturing event. Can you please provide me example?
Thanks

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