DataService.cs

public MemoryStream ConvertToPDF(string url)
        {
            if (!string.IsNullOrWhiteSpace(url))
            {
                HtmlWeb hw = new HtmlWeb();
                HtmlDocument hd = hw.Load(url);
                HtmlNode node = hd.DocumentNode.SelectSingleNode("html");
                string html = node.InnerText;

                MemoryStream ms = new MemoryStream();
                TextReader reader = new StringReader(html);

                Document document = new Document(PageSize.A4);

                PdfWriter writer = PdfWriter.GetInstance(document, ms);

                HTMLWorker worker = new HTMLWorker(document);
                
                document.Open();
                worker.StartDocument();
                worker.Parse(reader);

                worker.EndDocument();
                worker.Close();
                document.Close();

                File.WriteAllBytes(@"C:\temp\output.pdf", ms.ToArray());
                ms.Dispose();

                return ms;
            }

            return null;
        }