what's the difference between static event handler and non-static event handler

Question

Is there big difference between those two?

Answer 1

Semantically there are no differences, however using static event handlers can (if you're not careful) lead to memory leaks. See this article for more info.

I've come across this problem myself, trying to use a static event handler to keep an application-wide data source up to date; the event handler was preventing my BindingSource components from being disposed, leading to all sorts of weird problems...