''' <summary>
''' Loads PDF document from a file, adds page to PDF document and
''' saves changes to the new file.
''' </summary>
''' <param name="sourcePdfFilename">The filename of source PDF document.</param>
''' <param name="destPdfFilename">The filename of destination PDF document.</param>
Public Shared Sub OpenPdfDocumentAndSaveToNewFile(sourcePdfFilename As String, destPdfFilename As String)
    ' open PDF document
    Using document As New Vintasoft.Imaging.Pdf.PdfDocument(sourcePdfFilename)
        ' add new page to PDF document
        document.Pages.Add(Vintasoft.Imaging.PaperSizeKind.A4)

        ' save PDF document to the new file
        document.Save(destPdfFilename)
    End Using
End Sub

/// <summary>
/// Loads PDF document from a file, adds page to PDF document and
/// saves changes to the new file.
/// </summary>
/// <param name="sourcePdfFilename">The filename of source PDF document.</param>
/// <param name="destPdfFilename">The filename of destination PDF document.</param>
public static void OpenPdfDocumentAndSaveToNewFile(
    string sourcePdfFilename,
    string destPdfFilename)
{
    // open PDF document
    using (Vintasoft.Imaging.Pdf.PdfDocument document = 
        new Vintasoft.Imaging.Pdf.PdfDocument(sourcePdfFilename))
    {
        // add new page to PDF document
        document.Pages.Add(Vintasoft.Imaging.PaperSizeKind.A4);

        // save PDF document to the new file
        document.Save(destPdfFilename);
    }
}