public QheDichvuHinhanhVungkhaosatCollection FetchAll()
 {
     QheDichvuHinhanhVungkhaosatCollection coll = new QheDichvuHinhanhVungkhaosatCollection();
     Query qry = new Query(QheDichvuHinhanhVungkhaosat.Schema);
     coll.LoadAndCloseReader(qry.ExecuteReader());
     return coll;
 }
 public QheDichvuHinhanhVungkhaosatCollection FetchByID(object IdDichvu)
 {
     QheDichvuHinhanhVungkhaosatCollection coll = new QheDichvuHinhanhVungkhaosatCollection().Where("id_dichvu", IdDichvu).Load();
     return coll;
 }