private void bt_Tinh_Click(object sender, EventArgs e) { if (HoaDon.searchHoaDon(tbMaTiecCuoi.Text) != null) { DataTable dtHoaDon = HoaDon.searchHoaDon(tbMaTiecCuoi.Text); txtNgayDaiTiec.Text = "Đã hủy"; txtTongTienBan.Text = dtHoaDon.Rows[0][2].ToString(); txtTongTienDichVu.Text = dtHoaDon.Rows[0][3].ToString(); txtTongTienHoaDon.Text = dtHoaDon.Rows[0][4].ToString(); txtConLai.Text = dtHoaDon.Rows[0][5].ToString(); txtTienDatCoc.Text = HoaDon.getTienDatCoc(tbMaTiecCuoi.Text).ToString(); txtTongThanhToan.Text = txtConLai.Text; } else { try { txtSoLuongBan.Text = (HoaDon.getSoLuongBan(tbMaTiecCuoi.Text)).ToString(); double TongTienBan = HoaDon.TongTienBan(tbMaTiecCuoi.Text); double TongTienDichVu = HoaDon.TongTienDichVu(tbMaTiecCuoi.Text); double TienDatCoc = HoaDon.getTienDatCoc(tbMaTiecCuoi.Text); txtNgayDaiTiec.Text = HoaDon.getNgayDaiTiec(tbMaTiecCuoi.Text); txtTongTienHoaDon.Text = (TongTienBan + TongTienDichVu).ToString(); txtTongTienBan.Text = TongTienBan.ToString(); txtTongTienDichVu.Text = TongTienDichVu.ToString(); txtTienDatCoc.Text = TienDatCoc.ToString(); txtConLai.Text = ((TongTienBan + TongTienDichVu) - TienDatCoc).ToString(); datagv_chitietdichvu.DataSource = HoaDon.getChiTietDichVu(tbMaTiecCuoi.Text); txtTongThanhToan.Text = txtConLai.Text; } catch (Exception ex) { MessageBox.Show(ex.Message); } } }