private void m_cmd_them_Click(object sender, EventArgs e) { try { f801_DM_HOC_KY_DE f801 = new f801_DM_HOC_KY_DE(); f801.ShowDialog(); load_data_2_grid(); } catch (Exception v) { MessageBox.Show("Đã xảy ra lỗi trong hệ thống!"); } }