public DmucNhanvienCollection FetchAll()
 {
     DmucNhanvienCollection coll = new DmucNhanvienCollection();
     Query qry = new Query(DmucNhanvien.Schema);
     coll.LoadAndCloseReader(qry.ExecuteReader());
     return coll;
 }
 public DmucNhanvienCollection FetchByQuery(Query qry)
 {
     DmucNhanvienCollection coll = new DmucNhanvienCollection();
     coll.LoadAndCloseReader(qry.ExecuteReader());
     return coll;
 }
 public DmucNhanvienCollection FetchByID(object IdNhanvien)
 {
     DmucNhanvienCollection coll = new DmucNhanvienCollection().Where("id_nhanvien", IdNhanvien).Load();
     return coll;
 }