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# Undo-Redo

> Undo/redo is a popular UI feature, often implemented using the Memento pattern from the "Gang of Four's" Design Patterns.

Canonical: https://postsharp.net/metalama/applications/undo-redo.html

Undo/redo is a consistently popular feature, especially in UIs that do not rely on an _Ok_ button. A common way to implement it is by following the Memento pattern, originally formalized in the "Gang of Four's" Design Patterns book.

For details, see the [Memento Pattern](https://postsharp.net/metalama/applications/memento) on this website.

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