Private Sub SaveLastAcquiredImageToPdf(acquiredImage1 As Vintasoft.Twain.AcquiredImage, productName As String)
        ' set settings of PDF encoder
        Dim pdfEncoderSettings As New Vintasoft.Twain.ImageEncoders.TwainPdfEncoderSettings()
        pdfEncoderSettings.PdfDocumentInfo.Author = "VintaSoft LLC"
        pdfEncoderSettings.PdfDocumentInfo.Title = String.Format("Documents acquired from {0}", productName)
        pdfEncoderSettings.PdfDocumentInfo.Creator = "VintaSoft Twain .NET SDK"
        pdfEncoderSettings.PdfDocumentInfo.CreationDate = System.DateTime.Now

        ' save image to PDF document
        acquiredImage1.Save("c:\test.pdf", pdfEncoderSettings)
End Sub

private void SaveLastAcquiredImageToPdf(Vintasoft.Twain.AcquiredImage acquiredImage1, string productName)
{
    // set settings of PDF encoder
    Vintasoft.Twain.ImageEncoders.TwainPdfEncoderSettings pdfEncoderSettings =
        new Vintasoft.Twain.ImageEncoders.TwainPdfEncoderSettings();
    pdfEncoderSettings.PdfDocumentInfo.Author = "VintaSoft LLC";
    pdfEncoderSettings.PdfDocumentInfo.Title = string.Format("Documents acquired from {0}", productName);
    pdfEncoderSettings.PdfDocumentInfo.Creator = "VintaSoft Twain .NET SDK";
    pdfEncoderSettings.PdfDocumentInfo.CreationDate = System.DateTime.Now;

    // save image to PDF document
    acquiredImage1.Save(@"c:\test.pdf", pdfEncoderSettings);
}