There is a cool and beneficial tool in Windows 7 called PSR. Just type PSR on the Run command. Then Press the Start Record Button. It records all user interactions with applications running on your PC. When you are done, Press Stop Record and save the generated file ( a .mht file) that can be viewed in a Browser. You should give this a try.
To implement Undo, the simplest way is to use a MemoryStream object in your WaveDisplayForm (MDI Child) and simply serialize the Wave (which should be marked as [Serializable] to the stream and hold on to the stream object. private MemoryStream _undoStream = new MemoryStream(); private bool _canUndo = false; public void SaveForUndo() { BinaryFormatter bf = new BinaryFormatter(); bf.Serialize(_undoStream, wave); _undoStream.Flush(); // This rewinds the stream so that when it is used for deserialization, it's ready to use, // otherwise, the deserialization will start deserializing from the end of the stream and would fail. _undoStream.Position = 0; _canUndo = true; } public void Undo() { BinaryFormatter bf = new BinaryFormatter(); ...

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