/// <summary>
/// Save the given presentation to the given file name.
/// </summary>
/// <param name="presentation">non-null presentation to save</param>
/// <param name="fileName">non-null, writable filename</param>
/// <remarks>may throw any of the same exceptions that File.Create throws</remarks>
public void SavePresentation(PowerPoint.Presentation presentation, string fileName)
{
// TODO: error handling
System.IO.Stream stream = System.IO.File.Create(fileName);
IFormatter formatter = new BinaryFormatter();
SlideViewer.SlideDeck sd = this.MakeSlideDeck(presentation, fileName);
SlideViewer.CSDDocument csd = new SlideViewer.CSDDocument();
csd.SetInfo(sd);
formatter.Serialize(stream, csd);
stream.Close();
}