private void detach_RecordIndex(RecordIndex entity)
 {
     this.SendPropertyChanging();
     entity.Course = null;
 }
 partial void DeleteRecordIndex(RecordIndex instance);
 partial void InsertRecordIndex(RecordIndex instance);
 partial void UpdateRecordIndex(RecordIndex instance);
 private void attach_RecordIndex(RecordIndex entity)
 {
     this.SendPropertyChanging();
     entity.ClassInfo = this;
 }