This may be a basic question, but I have to admit I've never truly understood what the difference between the Control.Enter and Control.GotFocus events is.
http://msdn.microsoft.com/en-us/library/system.windows.forms.control.enter.aspx http://msdn.microsoft.com/en-us/library/system.windows.forms.control.gotfocus.aspx
Is it a differentiation between capturing keyboard or mouse input or something else?
The GotFocus/LostFocus events are generated by Windows messages, WM_SETFOCUS and WM_KILLFOCUS respectively. They are a bit troublesome, especially WM_KILLFOCUS which is prone to deadlock. The logic inside Windows Forms that handles the validation logic (Validating event for example) can override focus changes. The Enter/Leave events avoid this trouble, they are generated when WF has established the true focus. You'll want to use these.