private string GetPreSignedTestReader()
        {
            string paragraphText = "ASP.NET MVC PDF signing test @";
            _now = DateTime.Now;
            using (MemoryStream ms = new MemoryStream())
            {
                using (Document document = new Document())
                {
                    PdfWriter.GetInstance(document, ms);
                    document.Open();
                    document.Add(new Paragraph(
                        string.Format("{0}{1}", paragraphText, _now)
                    ));
                }

                WebSigner ws = new WebSigner();
                ws.SetSignatureBox(50, 670, 280, 760);
                return ws.PreSign(ms.ToArray());
            }
        }
 public ActionResult Index()
 {
     WebSigner ws = new WebSigner();
     ws.SetSignatureBox(50, 670, 280, 760);
     return View(model:GetPreSignedTestReader());
 }