private void btnExport_Click(object sender, EventArgs e)
        {
            List <string> StudentIDs = new List <string>();

            btnExport.Enabled = false;
            // 取得學生 ID

            foreach (StudentRecord studRec in Student.Instance.SelectedList)
            {
                StudentIDs.Add(studRec.ID);
            }

            object[] data = new object[1] {
                StudentIDs
            };
            BackgroundWorker bwWork = new BackgroundWorker();

            bwWork.DoWork             += new DoWorkEventHandler(bwWork_DoWork);
            bwWork.RunWorkerCompleted += new RunWorkerCompletedEventHandler(bwWork_RunWorkerCompleted);
            bwWork.RunWorkerAsync(data);

            //ApplicationLog.Log("產生教育程度檔", "產生","完成.共產生筆學生資料");
            ApplicationLog.CreateLogSaverInstance().Log("產生教育程度檔", "產生", "完成.共產生筆學生資料");
        }