private void detach_Sds(Sd entity)
 {
     this.SendPropertyChanging();
     entity.Sim = null;
 }
 private void attach_Sds(Sd entity)
 {
     this.SendPropertyChanging();
     entity.Sim = this;
 }
 partial void UpdateSd(Sd instance);
 partial void DeleteSd(Sd instance);
 partial void InsertSd(Sd instance);