如何让Internet Explorer保留流

我正在将CSV文件流式传输到Internet Explorer。在流式传输结束时，Internet Explorer会显示"打开"、"保存"answers"取消"对话框。如果在对话框显示后等待30秒，然后单击"打开"按钮，则Internet Explorer不会执行任何操作。这在Firefox中运行良好。除了在响应上刷新和结束之外，我还需要其他命令吗？这是我的代码：

protected void Page_Load(object sender, EventArgs e)
{
    DataTable dt = ReportService.GetAllOwnerAircraftPaymentInformation();
    //Generate the report
    using (MemoryStream stream = new MemoryStream())
    {
        StreamWriter writer = new StreamWriter(stream);
        CsvHelper csvHelper = new CsvHelper();
        csvHelper.DataTableToCsv(writer, dt);
        writer.Flush();
        //Send it to the browser
        stream.Seek(0, SeekOrigin.Begin);
        string fileName = string.Format("MassAVRMSDataExport{0}.csv", DateTime.Now.ToString("yyyyMMddhhmmss"));
        Response.ClearHeaders();
        Response.Clear();
        Response.ContentType = "application/octet-stream";
        Response.AddHeader("Content-Disposition", "attachment; filename='"" + fileName + "'"");
        Response.AddHeader("Content-Length", stream.Length.ToString(CultureInfo.InvariantCulture));
        StreamHelper.CopyStream(stream, Response.OutputStream);
        Response.Flush();
        Response.End();
    }
}

Response.ContentType = "application/download"

stream.Position = 0;
StreamHelper.CopyStream(stream, Response.OutputStream);