private void detach_titleauthor(titleauthor entity)
 {
     this.SendPropertyChanging();
     entity.titles = null;
 }
 private void attach_titleauthor(titleauthor entity)
 {
     this.SendPropertyChanging();
     entity.titles = this;
 }
 partial void Updatetitleauthor(titleauthor instance);
 partial void Deletetitleauthor(titleauthor instance);
 partial void Inserttitleauthor(titleauthor instance);