private void detach_pieces_users(pieces_users entity)
		{
			this.SendPropertyChanging();
			entity.pieces = null;
		}
		private void attach_pieces_users(pieces_users entity)
		{
			this.SendPropertyChanging();
			entity.pieces = this;
		}
 partial void Updatepieces_users(pieces_users instance);
 partial void Deletepieces_users(pieces_users instance);
 partial void Insertpieces_users(pieces_users instance);