public TinEditor( 
   Envelope extent
)

{
  //Example envelope
  TinEditor tinEditorFromEnvelope = new TinEditor(envelope);
  bool isInEditMode = tinEditorFromEnvelope.IsInEditMode;  // isInEditMode = true
}

{
  // Create a new TIN 
  tinEditor = new TinEditor(MapView.Active.Extent); // or use any envelope 
  tinEditor.AddMassPoints(points, 42, 13.7);

  // Since the TIN doesn't exist on disk, you can't call SaveEdits.
  // You must call SaveAs first.
  try
  {
    tinEditor.SaveEdits();
  }
  catch (TinException)
  {
    // Handle the exception
  }

  // Since the TIN doesn't exist on disk, you can't call StopEditing(true).
  // You must call SaveAs first.
  try
  {
    tinEditor.StopEditing(true);
  }
  catch (TinException)
  {
    // Handle the exception
  }

  // Now save the newly created TIN to disk
  tinEditor.SaveAs("C:\\Tin1", false);

  // Delete a node
  tinEditor.DeleteNode(7);

  // Since the TIN now exists on disk you can call SaveEdits
  tinEditor.SaveEdits();

  // Delete another node
  tinEditor.DeleteNode(11);

  // Since the TIN now exists on disk, you can call StopEditing(true).
  // The edits will be saved and the tin editor will be taken out of edit mode.
  tinEditor.StopEditing(true);
  bool isInEditMode = tinEditor.IsInEditMode; // isInEditMode = false

  // Now if you try to make an edit, an exception is thrown because the editor is not in edit mode.
  try
  {
    tinEditor.AddPointZ(pointZ, 0);
  }
  catch (TinException)
  {
    // Handle the exception
  }

  // Put the editor into edit mode.
  tinEditor.StartEditing();
  isInEditMode = tinEditor.IsInEditMode; // isInEditMode = true

  // Now you can add the point
  tinEditor.AddPointZ(pointZ, 0);

  // Oops, you didn't really want to add the point. You want to stop editing and discard the unsaved edits
  // since the last time the editor was put into edit mode. All previous saved edits remain.
  tinEditor.StopEditing(false);
}