private void AddHD() { HoaDon hd = new HoaDon(); hd.MaKH = int.Parse(cbMaKHang.Text); hd.MaNV = int.Parse(cbMaNVien.Text); hd.NgayDatHang = dtpNgayDatHang.Value; hd.NgayGiaoHang = dtpNgayGiaoHang.Value; ChiTietHD cthd = new ChiTietHD(); cthd.MaSP = int.Parse(cbMaSPham.Text); cthd.GiaBan = decimal.Parse(txtGiaBan.Text); cthd.SoLuong = int.Parse(txtSoLuong.Text); cthd.GiamGia = double.Parse(txtGiamGia.Text); cthd.ThanhTien = decimal.Parse(txtThanhTien.Text); hdBUS.AddHDBUS(hd, cthd); }