如何在不打开 PDF 的情况下通过电子邮件发送 PDF

我有这段代码，可以创建一个PDF文件，然后通过电子邮件发送。但是，当我运行它时，它会打开并将我的整个页面更改为 PDF。如何停止页面以打开 PDF？

 PdfWriter.GetInstance(document, Response.OutputStream);
 Response.ContentType = "application/pdf";
 Response.Cache.SetCacheability(HttpCacheability.NoCache);
 HTMLWorker htmlparser = new HTMLWorker(document);
 MemoryStream memoryStream = new MemoryStream();
 PdfWriter writer = PdfWriter.GetInstance(document, memoryStream);
 document.Open();
 document.Add(mainTable);
 Response.Write(document);
 writer.CloseStream = false;
 document.Close();
 memoryStream.Position = 0;
 EmailPresenter.SkyMail asd = new EmailPresenter.SkyMail();
 asd.SendMail("test@test.com", "This is a test email...", memoryStream, "Test.pdf");
 Response.End();