public KcbPhieuthuCollection FetchAll()
 {
     KcbPhieuthuCollection coll = new KcbPhieuthuCollection();
     Query qry = new Query(KcbPhieuthu.Schema);
     coll.LoadAndCloseReader(qry.ExecuteReader());
     return coll;
 }
 public KcbPhieuthuCollection FetchByQuery(Query qry)
 {
     KcbPhieuthuCollection coll = new KcbPhieuthuCollection();
     coll.LoadAndCloseReader(qry.ExecuteReader());
     return coll;
 }
 public KcbPhieuthuCollection FetchByID(object IdPhieuthu)
 {
     KcbPhieuthuCollection coll = new KcbPhieuthuCollection().Where("id_phieuthu", IdPhieuthu).Load();
     return coll;
 }