Do you need to remove an event handler in the destructor?

Question

I use some UserControls which get created and destroyed within my application during runtime (by creating and closing subwindows with these controls inside).
It

Answer 1

Event handlers are tricky and can easily hide a resource leak. As Tigran says. Use IDisposeable and forget about destructors. I recommend measuring whether you got it right. Just by looking at the memory consumption of your app in task manager will tell if a leak is present if you stress test it a little bit by loading up and closing a few thousand windows.