''' <summary>
''' Copies the first page of PDF document to the end of PDF document.
''' </summary>
''' <param name="pdfFileName">The filename of PDF document.</param>
Public Shared Sub CopyFirstPdfPageToEndOfPdfDocument(pdfFileName As String)
    ' open PDF document
    Using document As New Vintasoft.Imaging.Pdf.PdfDocument(pdfFileName)
        ' get the collection of pages of PDF document
        Dim pages As Vintasoft.Imaging.Pdf.Tree.PdfPageCollection = document.Pages

        ' add first page to the end of PDF document
        pages.Add(pages(0))

        ' save changes to a file
        document.SaveChanges()
    End Using
End Sub

/// <summary>
/// Copies the first page of PDF document to the end of PDF document.
/// </summary>
/// <param name="pdfFileName">The filename of PDF document.</param>
public static void CopyFirstPdfPageToEndOfPdfDocument(string pdfFileName)
{
    // open PDF document
    using (Vintasoft.Imaging.Pdf.PdfDocument document = 
        new Vintasoft.Imaging.Pdf.PdfDocument(pdfFileName))
    {
        // get the collection of pages of PDF document
        Vintasoft.Imaging.Pdf.Tree.PdfPageCollection pages = document.Pages;

        // add first page to the end of PDF document
        pages.Add(pages[0]);

        // save changes to a file
        document.SaveChanges();
    }
}