public static void UpdatePhieuBan(PhieuBanModel phieuBan)
 {
     using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
     {
         cnn.Execute("update PhieuBan set NGAYLAP=@NgayLap,MAKH=@MaKH,CHIETKHAU = @ChietKhau, THUE = @Thue, THANHTIEN = @ThanhTien, GHICHU = @GhiChu WHERE MAPHIEU = @maPhieu", phieuBan);
     }
 }
 public static void RemovePhieuBan(PhieuBanModel phieuBan)
 {
     using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
     {
         cnn.Execute("DELETE FROM PhieuBan WHERE MAPHIEU = @maPhieu", phieuBan);
     }
 }
 public static long SavePhieuBan(PhieuBanModel phieuBan)
 {
     using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
     {
         long lastRowID = (long)cnn.ExecuteScalar("insert into PhieuBan(MAPHIEU,NGAYLAP,MAKH,CHIETKHAU, THUE, THANHTIEN, GHICHU) values (@MaPhieu,@NgayLap,@MaKH,@ChietKhau, @Thue, @ThanhTien, @GhiChu); SELECT last_insert_rowid()", phieuBan);
         //lastRowID dùng để xác định ID của một hàng vừa được thêm vào.
         return(lastRowID);
     }
 }