''' <summary>
''' Creates PDF document with the optional content.
''' </summary>
''' <param name="pdfFilename">The PDF filename.</param>
Public Shared Sub CreateDocumentWithOptionalContent(pdfFilename As String)
    ' create new PDF document
    Using document As New Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename, Vintasoft.Imaging.Pdf.PdfFormat.Pdf_16)
        ' add empty page (A4 size)
        Dim page As Vintasoft.Imaging.Pdf.Tree.PdfPage = document.Pages.Add(Vintasoft.Imaging.PaperSizeKind.A4)

        ' create two optional content groups
        Dim layer1 As New Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentGroup(document, "Layer1")
        Dim layer2 As New Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentGroup(document, "Layer2")

        ' add optional content groups to OptionalContentProperties
        document.OptionalContentProperties = New Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentProperties(document)
        document.OptionalContentProperties.OptionalContentGroups.Add(layer1)
        document.OptionalContentProperties.OptionalContentGroups.Add(layer2)

        ' get PdfGraphics for PDF page
        Using g As Vintasoft.Imaging.Pdf.Drawing.PdfGraphics = page.GetGraphics()
            Dim font As Vintasoft.Imaging.Pdf.Tree.Fonts.PdfFont = document.FontManager.GetStandardFont(Vintasoft.Imaging.Pdf.Tree.Fonts.PdfStandardFontType.TimesRoman)
            Dim brush As New Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Black)
            Dim brush1 As New Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Green)
            Dim brush2 As New Vintasoft.Imaging.Pdf.Drawing.PdfBrush(System.Drawing.Color.Red)

            ' draw not optional content
            g.DrawString("Not optional content", font, 20, brush, New System.Drawing.PointF(50, 650))

            ' draw optional content "Layer1"
            g.BeginOptionalContent(layer1)
            g.DrawString(String.Format("Optional content '{0}'", layer1.Name), font, 25, brush1, New System.Drawing.PointF(50, 550))
            g.EndOptionalContent()

            ' draw not optional content
            g.DrawString("Not optional content", font, 30, brush, New System.Drawing.PointF(50, 450))

            ' draw optional content "Layer2"
            g.BeginOptionalContent(layer2)
            g.DrawString(String.Format("Optional content '{0}'", layer2.Name), font, 35, brush2, New System.Drawing.PointF(50, 350))
            g.EndOptionalContent()

            ' draw not optional content
            g.DrawString("Not optional content", font, 40, brush, New System.Drawing.PointF(50, 250))
        End Using

        ' create optional content configurations
        Dim configuration1 As New Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentConfiguration(document, "Layer1 and Layer2")
        configuration1.SetGroupVisibility(layer1, True)
        configuration1.SetGroupVisibility(layer2, True)
        Dim configuration2 As New Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentConfiguration(document, "Layer1")
        configuration2.SetGroupVisibility(layer1, True)
        configuration2.SetGroupVisibility(layer2, False)
        Dim configuration3 As New Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentConfiguration(document, "Layer2")
        configuration3.SetGroupVisibility(layer1, False)
        configuration3.SetGroupVisibility(layer2, True)
        Dim configuration4 As New Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentConfiguration(document, "No Layers")
        configuration4.SetGroupVisibility(layer1, False)
        configuration4.SetGroupVisibility(layer2, False)

        ' create list of optional content configuration
        document.OptionalContentProperties.Configurations = New Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentConfigurationList(document)

        ' add configurations to list
        document.OptionalContentProperties.Configurations.Add(configuration1)
        document.OptionalContentProperties.Configurations.Add(configuration2)
        document.OptionalContentProperties.Configurations.Add(configuration3)
        document.OptionalContentProperties.Configurations.Add(configuration4)

        ' set default configuration
        document.OptionalContentProperties.DefaultConfiguration = configuration1

        ' set presentation order
        configuration1.PresentationOrder = New Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentPresentationOrder(document, layer1, layer2)

        ' optional content panel is visible
        document.DocumentViewMode = Vintasoft.Imaging.Pdf.PdfDocumentViewMode.UseOC

        ' save changes in PDF document
        document.SaveChanges()
    End Using
End Sub

/// <summary>
/// Creates PDF document with the optional content.
/// </summary>
/// <param name="pdfFilename">The PDF filename.</param>
public static void CreateDocumentWithOptionalContent(string pdfFilename)
{
    // create new PDF document
    using (Vintasoft.Imaging.Pdf.PdfDocument document = 
        new Vintasoft.Imaging.Pdf.PdfDocument(pdfFilename, Vintasoft.Imaging.Pdf.PdfFormat.Pdf_16))
    {
        // add empty page (A4 size)
        Vintasoft.Imaging.Pdf.Tree.PdfPage page = document.Pages.Add(
            Vintasoft.Imaging.PaperSizeKind.A4);

        // create two optional content groups
        Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentGroup layer1 =
            new Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentGroup(document, "Layer1");
        Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentGroup layer2 =
            new Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentGroup(document, "Layer2");

        // add optional content groups to OptionalContentProperties
        document.OptionalContentProperties =
            new Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentProperties(document);
        document.OptionalContentProperties.OptionalContentGroups.Add(layer1);
        document.OptionalContentProperties.OptionalContentGroups.Add(layer2);

        // get PdfGraphics for PDF page
        using (Vintasoft.Imaging.Pdf.Drawing.PdfGraphics g = page.GetGraphics())
        {
            Vintasoft.Imaging.Pdf.Tree.Fonts.PdfFont font = document.FontManager.GetStandardFont(
                Vintasoft.Imaging.Pdf.Tree.Fonts.PdfStandardFontType.TimesRoman);
            Vintasoft.Imaging.Pdf.Drawing.PdfBrush brush = new Vintasoft.Imaging.Pdf.Drawing.PdfBrush(
                System.Drawing.Color.Black);
            Vintasoft.Imaging.Pdf.Drawing.PdfBrush brush1 = new Vintasoft.Imaging.Pdf.Drawing.PdfBrush(
                System.Drawing.Color.Green);
            Vintasoft.Imaging.Pdf.Drawing.PdfBrush brush2 = new Vintasoft.Imaging.Pdf.Drawing.PdfBrush(
                System.Drawing.Color.Red);

            // draw not optional content
            g.DrawString("Not optional content", font, 20, brush, new System.Drawing.PointF(50, 650));

            // draw optional content "Layer1"
            g.BeginOptionalContent(layer1);
            g.DrawString(string.Format("Optional content '{0}'", layer1.Name),
                font, 25, brush1, new System.Drawing.PointF(50, 550));
            g.EndOptionalContent();

            // draw not optional content
            g.DrawString("Not optional content", font, 30, brush, new System.Drawing.PointF(50, 450));

            // draw optional content "Layer2"
            g.BeginOptionalContent(layer2);
            g.DrawString(string.Format("Optional content '{0}'", layer2.Name),
                font, 35, brush2, new System.Drawing.PointF(50, 350));
            g.EndOptionalContent();

            // draw not optional content
            g.DrawString("Not optional content", font, 40, brush, new System.Drawing.PointF(50, 250));
        }

        // create optional content configurations
        Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentConfiguration configuration1 =
            new Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentConfiguration(document, "Layer1 and Layer2");
        configuration1.SetGroupVisibility(layer1, true);
        configuration1.SetGroupVisibility(layer2, true);
        Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentConfiguration configuration2 =
            new Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentConfiguration(document, "Layer1");
        configuration2.SetGroupVisibility(layer1, true);
        configuration2.SetGroupVisibility(layer2, false);
        Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentConfiguration configuration3 =
            new Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentConfiguration(document, "Layer2");
        configuration3.SetGroupVisibility(layer1, false);
        configuration3.SetGroupVisibility(layer2, true);
        Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentConfiguration configuration4 =
            new Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentConfiguration(document, "No Layers");
        configuration4.SetGroupVisibility(layer1, false);
        configuration4.SetGroupVisibility(layer2, false);

        // create list of optional content configuration
        document.OptionalContentProperties.Configurations =
            new Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentConfigurationList(document);

        // add configurations to list
        document.OptionalContentProperties.Configurations.Add(configuration1);
        document.OptionalContentProperties.Configurations.Add(configuration2);
        document.OptionalContentProperties.Configurations.Add(configuration3);
        document.OptionalContentProperties.Configurations.Add(configuration4);

        // set default configuration
        document.OptionalContentProperties.DefaultConfiguration = configuration1;

        // set presentation order
        configuration1.PresentationOrder =
            new Vintasoft.Imaging.Pdf.Tree.OptionalContent.PdfOptionalContentPresentationOrder(document, layer1, layer2);

        // optional content panel is visible
        document.DocumentViewMode = Vintasoft.Imaging.Pdf.PdfDocumentViewMode.UseOC;

        // save changes in PDF document
        document.SaveChanges();
    }
}