How to Create and Download pdf using iTextSharp

The given code snippet converts an HTML string to a PDF document using iTextSharp library in C#. The PDF is then served as a download to the user.

StringReader sr = new StringReader(strMailBody.ToString()); // strMailBody is a HTML string generated using HTML template.
Document pdfDoc = new Document(iTextSharp.text.PageSize.A4, 10f, 10f, 10f, 0f);
HTMLWorker htmlparser = new HTMLWorker(pdfDoc);

using (MemoryStream memoryStream = new MemoryStream())
{
    PdfWriter writer = PdfWriter.GetInstance(pdfDoc, memoryStream);
    pdfDoc.Open();

    htmlparser.Parse(sr);
    pdfDoc.Close();

    byte[] bytes = memoryStream.ToArray();
    memoryStream.Close();

    // Clears all content output from the buffer stream
    Response.Clear();
    // Gets or sets the HTTP MIME type of the output stream.
    Response.ContentType = "application/pdf";
    // Adds an HTTP header to the output stream
    Response.AddHeader("Content-Disposition", "attachment; filename=SponsorshipForm.pdf");
    // Gets or sets a value indicating whether to buffer output and send it after
    // the complete response is finished processing.
    Response.Buffer = true;
    // Sets the Cache-Control header to one of the values of System.Web.HttpCacheability.
    Response.Cache.SetCacheability(HttpCacheability.NoCache);

    // Writes a string of binary characters to the HTTP output stream. it write the generated bytes.
    Response.BinaryWrite(bytes);
    // Sends all currently buffered output to the client, stops execution of the
    // page, and raises the System.Web.HttpApplication.EndRequest event.
    Response.End();
    // Closes the socket connection to a client. it is a necessary step as you must close the response after doing work.its best approach.
    Response.Close();
}