private void detach_SageBook(SageBook entity)
 {
     this.SendPropertyChanging();
     entity.Book = null;
 }
 private void attach_SageBook(SageBook entity)
 {
     this.SendPropertyChanging();
     entity.Book = this;
 }
 partial void UpdateSageBook(SageBook instance);
 partial void DeleteSageBook(SageBook instance);
 partial void InsertSageBook(SageBook instance);