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Is there an advantage to dynamically attaching/detaching event handlers?
Would manually detaching handlers help ensure that there isn’t a reference remaining to a disposed object?
It’s not a question of using AddHandler versus Handles.
If you are concerned about the reference to your event handler interfering with garbage collection, you should use RemoveHandler, regardless of how the handler was attached. In the form or control’s Dispose method, remove any handlers.
I have had situations in Windows Forms apps (.NET 1.1 days) where an event handler would be called on controls that had no other references to them (and which for all intents and purposes were dead and I would have thought been GC’ed) — extremely hard to debug.
I would use RemoveHandler to get rid of handlers on controls that you are not going to reuse.