private void load_file_excel()
        {
            if(m_ofd_exel_file.ShowDialog() == System.Windows.Forms.DialogResult.OK) {
                try {
                    // Reset lại ds mới nếu chọn lại file excel khác
                    m_ds = new DS_EXCEL_IMPORT_HOC_VIEN();

                    m_lbl_loading_mes.Visible = true;
                    CExcelReport v_excel_rpt = new CExcelReport(m_ofd_exel_file.FileName);

                    m_ds.EnforceConstraints = false;
                    v_excel_rpt.Export2DatasetDS_by_DucVT(m_ds, m_ds.EXCEL_IMPORT_HOC_VIEN.TableName, 2);

                    m_fg.Redraw = false;

                    //Gán DataSource
                    //m_fg.DataSource = m_ds.DM_NHAN_SU;

                    CGridUtils.Dataset2C1Grid(m_ds, m_fg, m_obj_trans);
                    m_fg.Redraw = true;
                    m_lbl_loading_mes.Visible = false;

                }
                catch(Exception v_e) {
                    CSystemLog_301.ExceptionHandle(v_e);
                }
            }
        }