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