private void buttonUpdate_Click(object sender, EventArgs e) { try { if (Ivaild()) { loaiNguoiDung loainguoidung = new loaiNguoiDung { id = Convert.ToInt32(textBoxID.Text), tenLoaiNguoiDung = textBoxName.Text, moTa = textBoxMota.Text }; if (loainguoidung.update()) { loadLoaiNguoiDung(); } else { MessageBox.Show("fail"); } } else { MessageBox.Show("Dien Du Thong Tin"); } } catch (SqlException ex) { MessageBox.Show("Lỗi SQL exception !\n" + ex.Message); } }