using WR_ID;


 protected override void Page_Load(object sender, EventArgs e)
        {
            base.Page_Load(sender, e);
WUID wr_id = new WUID();
string IDD = wr_id.WR_UID(formID, SheetNo, "TEIAPMT420_W").ToString(); //錯誤發生在這裡， 並未將物件參考設定為物件的執行個體 
}