merge pdf pages in csharp

main.cs
using PdfSharp.Pdf;
using PdfSharp.Pdf.IO;

// Get paths of PDF documents to merge
string[] pdfPaths = { "document1.pdf", "document2.pdf", "document3.pdf" };

// Create a new PDF document
PdfDocument outputDocument = new PdfDocument();

// Loop through each PDF document and add its pages to the new document
foreach (string pdfPath in pdfPaths)
{
    // Open the PDF document
    PdfDocument inputDocument = PdfReader.Open(pdfPath, PdfDocumentOpenMode.Import);

    // Loop through each page in the PDF document and add it to the output document
    foreach (PdfPage page in inputDocument.Pages)
    {
        outputDocument.AddPage(page);
    }

    // Close the input document
    inputDocument.Close();
}

// Save the new PDF document
outputDocument.Save("merged.pdf");
774 chars
28 lines