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    <p><strike>It will get called unless your executable is forcibly closed (via task manager or <code>taskkill</code> from the command line) or the program crashes.</strike></p> <p>EDIT: I did some experimentation and found the following:</p> <ul> <li>If you set your reference to the form to null, the form remains visible, and when the form is closed, the event gets raised.</li> <li>If your form is a child form and the main form gets closed, the child form closes WITHOUT the event being raised.</li> <li>If you call the form's <code>Hide()</code> method, the event does NOT get raised. Subsequently closing the main form, as mentioned above, will not cause the event to get raised.</li> <li>Overriding <code>OnClosed()</code> will not help because it's still not called if the main form is closed.</li> <li>Calling the form's <code>Dispose()</code> method (which is what the GC would eventually do if nothings pointing at it) will also not cause the event to get raised.</li> </ul> <p>It looks like there really isn't a way to GUARANTEE the code will get called from within the form. You can put the code after the <code>Application.Run();</code> in your <code>Main()</code> and it will get called there. There's also an event for <code>Application.ApplicationExit</code> that would get called unless you have exceptional circumstances (forcibly closed or crash).</p> <p>You can register a handler for the <code>Application.ApplicationExit</code> event in your form, but be aware that by this time, your object has already been disposed, so you can't do anything with it.</p>
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    1. POAre events guaranteed to go off?
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    1. COWhat if a `SomeForm` instance is set to `null`, or reinstantiated?
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    2. COit isn't closed and thus the event isn't called.
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    3. COI'll admit that's a somewhat contrived case, but the OP did ask "Is it safe to assume that the FormClosed event will fire every time something like the destructor is run?"
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