SelectPdf for .NET - Modify Existing Pdf - C# / ASP.NET 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;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using SelectPdf;

namespace SelectPdf.Samples
    public partial class modify_existing_pdf : System.Web.UI.Page
        protected void BtnCreatePdf_Click(object sender, EventArgs e)
            // 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
            doc.Save(Response, false, "Sample.pdf");

            // close pdf document