public DmucChungCollection FetchAll()
 {
     DmucChungCollection coll = new DmucChungCollection();
     Query qry = new Query(DmucChung.Schema);
     coll.LoadAndCloseReader(qry.ExecuteReader());
     return coll;
 }
 public DmucChungCollection FetchByQuery(Query qry)
 {
     DmucChungCollection coll = new DmucChungCollection();
     coll.LoadAndCloseReader(qry.ExecuteReader());
     return coll;
 }
 public DmucChungCollection FetchByID(object Ma)
 {
     DmucChungCollection coll = new DmucChungCollection().Where("MA", Ma).Load();
     return coll;
 }