Impose PDF using C#. For more details: https://kb.aspose.com/pdf/net/impose-pdf-using-csharp/

Impose PDF using C#.cs

using Aspose.Pdf;
using Aspose.Pdf.Facades;
class Program
{
    static void Main(string[] args)
    {
        License lic = new License();
        lic.SetLicense("license.lic");

        // Create PdfFileEditor object
        PdfFileEditor pdfEditor = new PdfFileEditor();

        // Set output pages organization
        int[] leftPages = new int[] { 1, 3 };
        int[] rightPages = new int[] { 2, 4 };

        // Make booklet
        pdfEditor.MakeBooklet("input.pdf", "output.pdf", leftPages, rightPages);

        System.Console.WriteLine("PDF Imposition performed successfully");
    }
}