Wave Undo

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();
     _wave = (Wave)bf.Deserialize(_undoStream);
     _canUndo = false;

     // increment the modified counter on the wave (However you implemented this), i did it using the following method on the Wave object
     _wave.DecrementModificationCounter(); // simply does a _modifiedCounter--

     Invalidate();

}