private void btnCapnhat_Click(object sender, EventArgs e) { DataGridViewRow row = dataGridViewNguoiDung.CurrentRow; string maso = row.Cells["colmaso"].Value.ToString(); string username = row.Cells["colusername"].Value.ToString(); string loaitaikhoancol = row.Cells["colquyen"].Value.ToString(); data.UpdateNguoiDung(username, loaitaikhoancol, maso); loadNguoiDung(); }