Generate iTextSharp PDF Direct from Memory

If you need to dynamically generate a PDF using iTextSharp and you don't want to write to the disk, use the MemoryStream and PdfWriter.

using System;
using System.IO;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

using iTextSharp.text;
using iTextSharp.text.pdf;

public partial class GetPDF : System.Web.UI.Page
{
   protected void Page_Load(object sender, EventArgs e)
   {
       byte[] pdf = GetPdfDocument();

       Response.ContentType = "application/pdf";
       Response.AddHeader("Content-Disposition", "attachment;filename=MyDocument.pdf");
       Response.OutputStream.Write(pdf, 0, pdf.Length);
   }

   private byte[] GetPdfDocument() {
       byte[] result;

       using (MemoryStream ms = new MemoryStream()) {
           Document doc = new Document();
           PdfWriter.GetInstance(doc, ms);
           doc.AddTitle("Document Title");
           doc.Open();
           doc.Add(new Paragraph("My paragraph."));
           doc.Close();
           result = ms.GetBuffer();
       }

       return result;
   }
}