''' <summary>
''' Verifies a PDF document to conformance with PDF/A-1b specification.
''' </summary>
''' <param name="pdfFilename">The filename of PDF document.</param>
Public Shared Sub VerifyDocumentToPdfA1b(pdfFilename As String)
    ' open PDF document
    Using document As New Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename)
        ' verify that PDF document conforms PDF/A-1b and output the result

        System.Console.WriteLine("Verification...")
        If document.VerifyDocument(Vintasoft.Imaging.Pdf.PdfDocumentConformance.PdfA_1b) Then
            System.Console.WriteLine("Document conforms to PDF/A-1b.")
        Else
            System.Console.WriteLine("Document does not conform to PDF/A-1b.")
        End If
    End Using
End Sub

/// <summary>
/// Verifies a PDF document to conformance with PDF/A-1b specification.
/// </summary>
/// <param name="pdfFilename">The filename of PDF document.</param>
public static void VerifyDocumentToPdfA1b(string pdfFilename)
{
    // open PDF document
    using (Vintasoft.Imaging.Pdf.PdfDocument document = new Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename))
    {
        // verify that PDF document conforms PDF/A-1b and output the result

        System.Console.WriteLine("Verification...");
        if (document.VerifyDocument(Vintasoft.Imaging.Pdf.PdfDocumentConformance.PdfA_1b))
            System.Console.WriteLine("Document conforms to PDF/A-1b.");
        else
            System.Console.WriteLine("Document does not conform to PDF/A-1b.");
    }
}