Given a Windows Form with 3 buttons Copy, Move, Delete.
Pressing each button prompts the user to select a file on which to perform the action.
There is a base class "BaseCommand" and 3 derived classes CopyCommand, MoveCommand, DeleteCommand which implement the actions: copy, move, delete a file.
To do (your task): Add a button 'Undo' and implement undoing the last operation(s).

Question

Given a Windows Form with 3 buttons Copy, Move, Delete. 
Pressing each button prompts the user to select a file on which to perform the action.
There is a base class "BaseCommand" and 3 derived classes CopyCommand, MoveCommand, DeleteCommand which implement the actions: copy, move, delete a file.
To do (your task): Add a button 'Undo' and implement undoing the last operation(s).

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