Print a PDF/A-1b

Hello!
How i can print a PDF/A using a Visual Basic 2010 application?

I use...

Public Sub cConvertFile(ByVal Filetyp As String, Optional ByVal SubFormat As String = "PDF/A-1b")
        Dim fname As String, fi As FileInfo, DefaultPrinter As String
        Dim opt As PDFCreator.clsPDFCreatorOptions
        Dim opt2 As PDFCreator.clsPDFCreator

        With OpenFileDialog1
            .Multiselect = False
            .CheckFileExists = True
            .CheckPathExists = True
            '.Filter = "Text files (*.txt)|*.txt|All files (*.*)|*.*"
        End With
        If OpenFileDialog1.ShowDialog = DialogResult.OK Then
            fi = New FileInfo(OpenFileDialog1.FileName)
            If InStr(fi.Name, ".", CompareMethod.Text) > 1 Then
                fname = Mid(fi.Name, 1, InStr(fi.Name, ".", CompareMethod.Text) - 1)
            Else
                fname = fi.Name
            End If
            '  If Not _PDFCreator.cIsPrintable(fi.FullName) Then
            'MsgBox("File '" & fi.FullName & "' is not printable!", MsgBoxStyle.Exclamation, Me.Text)
            ' Exit Sub
            ' End If
            opt = _PDFCreator.cOptions
            With opt
                .UseAutosave = 1
                .UseAutosaveDirectory = 1
                .AutosaveDirectory = fi.DirectoryName
                .AutosaveFormat = Filetyp

                If Filetyp = 5 Then
                    .TIFFResolution = 72
                End If
                opt.AutosaveFilename = fname
            End With
  
            With _PDFCreator

                .cOptions = opt
                .cClearCache()
                DefaultPrinter = .cDefaultPrinter
                .cDefaultPrinter = "PDFCreator"
                .cPrintFile(fi.FullName)
                ReadyState = False
                .cPrinterStop = False
            End With

            With Timer1
                .Interval = maxTime * 1000
                .Enabled = True
                Do While Not ReadyState And .Enabled
                    Application.DoEvents()
                Loop
                .Enabled = False
            End With
            If Not ReadyState Then
                MsgBox("Creating printer test page as pdf." & vbCrLf & vbCrLf & _
                 "An error is occured: Time is up!", MsgBoxStyle.Exclamation, Me.Text)
            End If
            _PDFCreator.cPrinterStop = True
            _PDFCreator.cDefaultPrinter = DefaultPrinter
        End If
        opt = Nothing
    End Sub



    Private Sub Button7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button7.Click
        cConvertFile(0, "PDF/A-1b")
    End Sub

Thanks