public SelectionSet Modifies {get;}

// Subscribe to the <see cref="ArcGIS.Desktop.Editing.Events.EditCompletedEvent"/>,
// allowing the application to respond to edit operations such as feature creation, modification, or deletion.public static void SubEditEvents()
var eceToken = EditCompletedEvent.Subscribe(editCompletedEventArgs =>
  {
    //show number of edits
    Console.WriteLine("Creates: " + editCompletedEventArgs.Creates.ToDictionary().Values.Sum(list => list.Count).ToString());
    Console.WriteLine("Modifies: " + editCompletedEventArgs.Modifies.ToDictionary().Values.Sum(list => list.Count).ToString());
    Console.WriteLine("Deletes: " + editCompletedEventArgs.Deletes.ToDictionary().Values.Sum(list => list.Count).ToString());
    return Task.FromResult(0);
  });