private void detach_Dats(Dat entity)
		{
			this.SendPropertyChanging();
			entity.TinBai = null;
		}
		private void attach_Dats(Dat entity)
		{
			this.SendPropertyChanging();
			entity.TinBai = this;
		}
 partial void UpdateDat(Dat instance);
 partial void DeleteDat(Dat instance);
 partial void InsertDat(Dat instance);