public FileResult ExportAdvertisers(bool?privacy)
        {
            AdsDetailStatisticsSearchModel search = Session["ExportAdvertiserSearch"] as AdsDetailStatisticsSearchModel;

            if (search == null)
            {
                search = new AdsDetailStatisticsSearchModel();
            }

            ViewData["AdvertiserInfo"]    = AdvertisementStatisticsDAO.GetAllAdvertisers(search);
            ViewData["AdvertiserPrivacy"] = privacy ?? false;

            string html = Utility.GetViewHtml(this, "ExportAdvertisers", null);

            string title = $"廣告主分析報表-{DateTime.Now.ToString("yyyyMMddHHmmsss")}.xls";

            return(File(System.Text.Encoding.UTF8.GetBytes(html), "application/vnd.ms-excel", title));
        }