Пример #1
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 public ChiTietHDBanBLL()
 {
     db = new QuanLyBanHangDataContext();
 }
Пример #2
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 public HoaDonBLL()
 {
     db = new QuanLyBanHangDataContext();
 }
Пример #3
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 public KhachHangBLL()
 {
     db = new QuanLyBanHangDataContext();
 }
Пример #4
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 public NhanVienBLL()
 {
     db = new QuanLyBanHangDataContext();
 }