区域报表绑定数据源后输出PDF保存打开对话框，点击保存或则打开时出错

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HIkakuHyo rpt = new HIkakuHyo();
            rpt.UnboundDataSource = newDataTable;

            Response.ContentType = "application/pdf";
            Response.AddHeader("content-disposition", "attachment; filename=" + HttpUtility.UrlEncode(fe_MakeFileName(newDataTable, ChouhyouType) + ".pdf", System.Text.Encoding.UTF8));
GrapeCity.ActiveReports.Export.Pdf.Section.PdfExport pdf = new GrapeCity.ActiveReports.Export.Pdf.Section.PdfExport();
            System.IO.MemoryStream memStream = new System.IO.MemoryStream();
pdf.Export(rpt.Document, memStream);
            Response.BinaryWrite(memStream.ToArray());
            Response.Flush();
Response.Close();