partial void DeleteRace(Race instance);
 partial void UpdateRace(Race instance);
 private void detach_Races(Race entity)
 {
     this.SendPropertyChanging();
     entity.Circuit = null;
 }
 partial void InsertRace(Race instance);
 private void attach_Races(Race entity)
 {
     this.SendPropertyChanging();
     entity.Circuit = this;
 }