/// <summary>
 /// Invoke SubjectAdded event
 /// </summary>
 /// <param name="subject">New subject</param>
 internal static void Call_SubjectDeleted(Subject subject)
 {
     SubjectDeleted?.Invoke(subject);
 }
 public void Handle(SubjectDeleted e)
 {
     CreateRevision(e.Id);
 }
 public void Handle(SubjectDeleted e)
 {
     _subjects.Delete(e.Id);
 }