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Using GZipStream to compress an XML file?

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I'm currently saving my files using the XmlWriter class in .NET:

SaveData saveData = new SaveData();
game.WriteObjects(ref saveData);

Stream stream;

SaveFileDialog saveFileDialog = new SaveFileDialog();
saveFileDialog.AddExtension = true;
saveFileDialog.CheckFileExists = false;
saveFileDialog.CheckPathExists = true;
saveFileDialog.InitialDirectory = Application.StartupPath;
saveFileDialog.Filter = "XML files (*.xml)|*.xml";
saveFileDialog.FilterIndex = 2;
saveFileDialog.RestoreDirectory = true;

if (saveFileDialog.ShowDialog() == DialogResult.OK)
if ((stream = saveFileDialog.OpenFile()) != null)
XmlWriterSettings settings = new XmlWriterSettings();
settings.ConformanceLevel = ConformanceLevel.Auto;
settings.Encoding = System.Text.Encoding.UTF8;
settings.Indent = true;

using (XmlWriter xmlWriter = XmlWriter.Create(stream, settings))
saveDataSerializer.Serialize(xmlWriter, saveData);

using (GZipStream compressedStream = new GZipStream(stream, CompressionMode.Compress, false))
//compressedStream.Write(buffer, 0, buffer.Length);


How can I compress the .XML file as it is written (so it is saved as a compressed file) using GZipStream? I think I require a byte array but I don't know how to access that when using XmlWriter.

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