public sealed class EditCompletedEvent : ArcGIS.Core.Events.AsyncPresentationEvent<EditCompletedEventArgs> 

protected void subEditEvents()
{
  //subscribe to editcompleted
  var eceToken = EditCompletedEvent.Subscribe(onEce);
}

protected Task onEce(EditCompletedEventArgs args)
{
  //show number of edits
  Console.WriteLine("Creates: " + args.Creates.ToDictionary().Values.Sum(list => list.Count).ToString());
  Console.WriteLine("Modifies: " + args.Modifies.ToDictionary().Values.Sum(list => list.Count).ToString());
  Console.WriteLine("Deletes: " + args.Deletes.ToDictionary().Values.Sum(list => list.Count).ToString());
  return Task.FromResult(0);
}