public dalTieuDe() { db = new BangDiaDataClassesDataContext(); }
public dalPhieuDat() { db = new BangDiaDataClassesDataContext(); }
public dalThongKeTheoKhachHang() { db = new BangDiaDataClassesDataContext(); }
public dalKhachHang() { db = new BangDiaDataClassesDataContext(); }
public dalTaiKhoan() { db = new BangDiaDataClassesDataContext(); }