private void thêmToolStripMenuItem_Click(object sender, EventArgs e) { dtgv.CurrentCell = dtgv.Rows[0].Cells[0]; int id = 0; string tenban = null; string status = null; for (int i = 0; i < dtgv.RowCount - 1; i++) { id = Int32.Parse(dtgv.Rows[i].Cells[0].Value.ToString()); tenban = dtgv.Rows[i].Cells[1].Value.ToString(); status = dtgv.Rows[i].Cells[2].Value.ToString(); webservice.updateData(id, tenban, status); } MessageBox.Show("Update success"); loadData(); }