public TChiadonviThuocCollection FetchAll()
 {
     TChiadonviThuocCollection coll = new TChiadonviThuocCollection();
     Query qry = new Query(TChiadonviThuoc.Schema);
     coll.LoadAndCloseReader(qry.ExecuteReader());
     return coll;
 }
 public TChiadonviThuocCollection FetchByQuery(Query qry)
 {
     TChiadonviThuocCollection coll = new TChiadonviThuocCollection();
     coll.LoadAndCloseReader(qry.ExecuteReader());
     return coll;
 }