private BillDTO ThongTinHoaDonThanhToan(int i) { BillDTO infor = new BillDTO(); int maphong = int.Parse(dgvHoaDon.Rows[i].Cells["colMaPhong"].Value.ToString()); //tai sao la null //int maphong = int.Parse(cmbMaPhong.SelectedIndex.ToString()); infor.MaPhong = maphong; List <BillDTO> lst = new List <BillDTO>(); lst = BillBUS.LayMaPhieuThue(maphong); infor.MaPhieuThue = lst[0].MaPhieuThue.Value; infor.SoNgayDaThue = int.Parse(dgvHoaDon.Rows[i].Cells["colSoNgayThue"].Value.ToString()); infor.DonGia = Convert.ToDecimal(dgvHoaDon.Rows[i].Cells["colDonGia"].Value.ToString()); infor.ThanhTien = Convert.ToDecimal(dgvHoaDon.Rows[i].Cells["colThanhTien"].Value.ToString()); infor.NgayThanhToan = Convert.ToDateTime(dtpNgayThanhToan.Text); return(infor); }