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Load Existing PDF Document - C#

PDF SDK sample in C# demonstrating ‘Load Existing PDF Document’

Program.cs
using System.Diagnostics;
using Bytescout.PDF;

namespace LoadDocument
{
    /// <summary>
    /// This example demonstrates how to load and modify an existing document.
    /// </summary>
    class Program
    {
        static void Main()
        {
            // Create new Document object
            Document pdfDocument = new Document();
            pdfDocument.RegistrationName = "demo";
            pdfDocument.RegistrationKey = "demo";
            
            // Load existing document
            pdfDocument.Load("sample.pdf");
            
            // Add new page to loaded document
            Page page = new Page(PaperFormat.A4);
            Font font = new Font(StandardFonts.Times, 24);
            Brush brush = new SolidBrush();
            page.Canvas.DrawString("New Page", font, brush, 20, 20);
            pdfDocument.Pages.Add(page);
            
            // Save document to file
            pdfDocument.Save("result.pdf");

            // Cleanup 
            pdfDocument.Dispose();

            // Open result document in default associated application (for demo purpose)
            ProcessStartInfo processStartInfo = new ProcessStartInfo("result.pdf");
            processStartInfo.UseShellExecute = true;
            Process.Start(processStartInfo);
        }
    }
}

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