Public Shared Sub CreatePdfDocumentInMemory(images As Vintasoft.Imaging.ImageCollection)
    ' create new PDF document version 1.4 in the memory
    Using document As New Vintasoft.Imaging.Pdf.PdfDocument(New Vintasoft.Imaging.Pdf.PdfFormat("1.4"))
        ' create an empty image
        Using image As New Vintasoft.Imaging.VintasoftImage(600, 800)
            ' add image to PDF document
            document.Pages.Add(image)
        End Using

        ' save document to a file
        document.Save("doc.pdf")
    End Using
End Sub

public static void CreatePdfDocumentInMemory(Vintasoft.Imaging.ImageCollection images)
{
    // create new PDF document version 1.4 in the memory
    using (Vintasoft.Imaging.Pdf.PdfDocument document = new Vintasoft.Imaging.Pdf.PdfDocument(
        new Vintasoft.Imaging.Pdf.PdfFormat("1.4")))
    {
        // create an empty image
        using (Vintasoft.Imaging.VintasoftImage image = new Vintasoft.Imaging.VintasoftImage(600, 800))
        {
            // add image to PDF document
            document.Pages.Add(image);
        }

        // save document to a file
        document.Save("doc.pdf");
    }
}