// NuGet: Install-Package Syncfusion.Pdf.Net.Core
using Syncfusion.Pdf;
using Syncfusion.Pdf.Graphics;
using Syncfusion.Drawing;
using System.IO;

class Program
{
    static void Main()
    {
        // Create a new PDF document
        PdfDocument document = new PdfDocument();

        // Add a page
        PdfPage page = document.Pages.Add();

        // Create a font
        PdfFont font = new PdfStandardFont(PdfFontFamily.Helvetica, 12);

        // Draw text
        page.Graphics.DrawString("Hello, World!", font, PdfBrushes.Black, new PointF(10, 10));

        // Save the document
        FileStream fileStream = new FileStream("Output.pdf", FileMode.Create);
        document.Save(fileStream);
        document.Close(true);
        fileStream.Close();
    }
}

// NuGet: Install-Package IronPdf
using IronPdf;
using IronPdf.Rendering;

class Program
{
    static void Main()
    {
        // Create a PDF from HTML string
        var renderer = new ChromePdfRenderer();
        var pdf = renderer.RenderHtmlAsPdf("<h1>Hello, World!</h1>");

        // Save the document
        pdf.SaveAs("Output.pdf");
    }
}

// NuGet: Install-Package Syncfusion.Pdf.Net.Core
using Syncfusion.Pdf;
using Syncfusion.Pdf.Parsing;
using System.IO;

class Program
{
    static void Main()
    {
        // Load the first PDF document
        FileStream stream1 = new FileStream("Document1.pdf", FileMode.Open, FileAccess.Read);
        PdfLoadedDocument loadedDocument1 = new PdfLoadedDocument(stream1);

        // Load the second PDF document
        FileStream stream2 = new FileStream("Document2.pdf", FileMode.Open, FileAccess.Read);
        PdfLoadedDocument loadedDocument2 = new PdfLoadedDocument(stream2);

        // Merge the documents
        PdfDocument finalDocument = new PdfDocument();
        finalDocument.ImportPageRange(loadedDocument1, 0, loadedDocument1.Pages.Count - 1);
        finalDocument.ImportPageRange(loadedDocument2, 0, loadedDocument2.Pages.Count - 1);

        // Save the merged document
        FileStream outputStream = new FileStream("Merged.pdf", FileMode.Create);
        finalDocument.Save(outputStream);

        // Close all documents
        finalDocument.Close(true);
        loadedDocument1.Close(true);
        loadedDocument2.Close(true);
        stream1.Close();
        stream2.Close();
        outputStream.Close();
    }
}

// NuGet: Install-Package IronPdf
using IronPdf;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        // Load PDF documents
        var pdf1 = PdfDocument.FromFile("Document1.pdf");
        var pdf2 = PdfDocument.FromFile("Document2.pdf");

        // Merge PDFs
        var merged = PdfDocument.Merge(new List<PdfDocument> { pdf1, pdf2 });

        // Save the merged document
        merged.SaveAs("Merged.pdf");
    }
}