Example about 3 Net Tier.You can download this source code for apply bis solution

BAN_DIEN_THOAI_Update24h.info
.............................\go
.............................\..\dac ta ban dien thoai.doc
.............................\..\QuanLyMuaBan_Data.MDF
.............................\..\QuanLyMuaBan_Log.LDF
.............................\..\Quan_Ly_Mua_Ban
.............................\..\...............\Amin.cs
.............................\..\...............\Amin.resx
.............................\..\...............\app.config
.............................\..\...............\App.ico
.............................\..\...............\AssemblyInfo.cs
.............................\..\...............\Backup
.............................\..\...............\......\Amin.cs
.............................\..\...............\......\Amin.resx
.............................\..\...............\......\app.config
.............................\..\...............\......\App.ico
.............................\..\...............\......\AssemblyInfo.cs
.............................\..\...............\......\BaoCaoChiTietHopDong.cs
.............................\..\...............\......\BaoCaoChiTietHopDong.resx
.............................\..\...............\......\BaoCaoChiTietHopDongMua.cs
.............................\..\...............\......\BaoCaoChiTietHopDongMua.resx
.............................\..\...............\......\BaoCaoHangHoa.cs
.............................\..\...............\......\BaoCaoHangHoa.resx
.............................\..\...............\......\BaoCaoPhieuChi.cs
.............................\..\...............\......\BaoCaoPhieuChi.resx
.............................\..\...............\......\BaoCaoPhieuThu.cs
.............................\..\...............\......\BaoCaoPhieuThu.resx
.............................\..\...............\......\CheckError.cs
.............................\..\...............\......\Chi_Tiet_Don_Hang.cs
.............................\..\...............\......\Chi_Tiet_Don_Hang.resx
.............................\..\...............\......\Chi_Tiet_Hop_Dong_Cung_Ung.cs
.............................\..\...............\......\Chi_Tiet_Hop_Dong_Cung_Ung.resx
.............................\..\...............\......\ConnectSQL.cs
.............................\..\...............\......\ConnectSQL.resx
.............................\..\...............\......\connet.cs
.............................\..\...............\......\DisplayIcon.cs
.............................\..\...............\......\frmAbout.cs
.............................\..\...............\......\frmAbout.resx
.............................\..\...............\......\Gia.cs
.............................\..\...............\......\Gia.resx
.............................\..\...............\......\Hang_Hoa_Loai.cs
.............................\..\...............\......\Hang_Hoa_Loai.resx
.............................\..\...............\......\Hang_Hoa_Thong_ke.cs
.............................\..\...............\......\Hang_Hoa_Thong_ke.resx
.............................\..\...............\......\HinhAnh.cs
.............................\..\...............\......\HinhAnh.resx
.............................\..\...............\......\KhachOnly.cs
.............................\..\...............\......\KhachOnly.resx
.............................\..\...............\......\Khach_Hang_Nhom.cs
.............................\..\...............\......\Khach_Hang_Nhom.resx
.............................\..\...............\......\K_Hang_Thong_ke.cs
.............................\..\...............\......\K_Hang_Thong_ke.resx
.............................\..\...............\......\Log_on.cs
.............................\..\...............\......\Log_on.resx
.............................\..\...............\......\Luu_Tru_Hop_Dong_Ban.cs
.............................\..\...............\......\Luu_Tru_Hop_Dong_Ban.resx
.............................\..\...............\......\Luu_Tru_Hop_Dong_Mua.cs
.............................\..\...............\......\Luu_Tru_Hop_Dong_Mua.resx
.............................\..\...............\......\Main.cs

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