How can I implement effective Undo/Redo into my WinForms application?

This is a very basic idea, and I'm sure that many improvements could be made.

One way to do this is use the TextChanged event to periodically store the contents of richtextbox. Text in an array or list, as a stack. When you undo, "pop the stack" and copy the most recent version on the stack into richtextbox.text.

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