private void dgvthongke_CellClick(object sender, DataGridViewCellEventArgs e) { try { tbxten.ResetText(); tbxvoucher.ResetText(); int r = dgvthongke.CurrentCell.RowIndex; int idbill = (int)dgvthongke.Rows[r].Cells[0].Value; dgvdetails.DataSource = bill.BillDetails(idbill); tbxten.Text = nhanvien.GetNameEmployeeFromBill(idbill); tbxvoucher.Text = voucher.GetNameVoucherFromBill(idbill); } catch { } }