private void detach_DrawingInDBs(DrawingInDB entity)
 {
     this.SendPropertyChanging();
     entity.Sheet = null;
 }
 private void attach_DrawingInDBs(DrawingInDB entity)
 {
     this.SendPropertyChanging();
     entity.Sheet = this;
 }
 partial void UpdateDrawingInDB(DrawingInDB instance);
 partial void DeleteDrawingInDB(DrawingInDB instance);
 partial void InsertDrawingInDB(DrawingInDB instance);