SelectPdf for .NET - Modify Existing Pdf - C# / ASP.NET MVC Sample

This sample shows how to use SelectPdf Library for .NET to load an existing document, add a new page to it and a new text element.

Here is our initial test pdf document:
Test file

Click on the "Create PDF" button below to see the result.

Sample Code C#

using System.Web.Mvc;

namespace SelectPdf.Samples.Controllers
    public class ModifyExistingPdfController : Controller
        // GET: ModifyExistingPdf
        public ActionResult Index()
            return View();

        public ActionResult SubmitAction(FormCollection collection)
            // the initial file
            string file = Server.MapPath("~/files/doc1.pdf");

            // load the pdf document
            PdfDocument doc = new PdfDocument(file);

            // add a new page to the document
            PdfPage page = doc.AddPage();

            // create a new pdf font (component standard font)
            PdfFont font = doc.AddFont(PdfStandardFont.Helvetica);
            font.Size = 20;

            // create text element and add it to the new page
            PdfTextElement text = new PdfTextElement(100, 100,
                "Sample text added to an existing pdf document.", font);

            // save pdf document
            byte[] pdf = doc.Save();

            // close pdf document

            // return resulted pdf document
            FileResult fileResult = new FileContentResult(pdf, "application/pdf");
            fileResult.FileDownloadName = "Document.pdf";
            return fileResult;