how to send dynamic created Pdf document as attachment in email

MemoryStream ms = new MemoryStream();

Document doc = new Document(PageSize.A4, 10f, 10f, 100f, 0.0f);
//require custom parsers? add here.
PdfWriter writer = PdfWriter.GetInstance(doc, ms);
doc.Open(); //open doc for editing

//do layout
//doc.Add(new Paragraph("First Paragraph"));
//doc.Add(new Paragraph("Second Paragraph"));

writer.CloseStream = false; //important
doc.Close(); //build the doc.

memoryStream.Position = 0; //reset stream... important

mail.Attachments.Add(new Attachment(ms, "filename.pdf"));

smtp.Send(mail);