The three modifier keys are Control, Alt and Shift.
In the keys enumeration, there are Control and ControlKey, Shift and ShiftKey and Alt, but AltKey is missing.
Keys.ControlKey refers to the actual Ctrl key while Keys.Control refers to the control modification. Similarly,Keys.ShiftKey refers to the actual Shift key while Keys.Shift refers to the shift modification.
What about the actual Alt key?
It can be pressed by itself and the corresponding element in the Keys enumeration should be Keys.AltKey!
Can you please explain the lack of the vlaue Keys.AltKey in the Keys enumeration?