Do function on process close?

Say I have created a process using Process.Star开发者_如何学JAVAt();.

How would I tell if it had been closed/terminated, without freezing the application?

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Try the following

Process p = Process.Start(...);
p.Exited += OnProcessExited;

private void OnProcessExited(object sender, EventArgs e) {
  // Put code here
}

There is one catch to this code though. It's possible for the Process to exit before the event handler is attached. So you may not receive this event for a Process which exits quickly.