Task<string> SummarizeAsync(
    PdfDocumentProcessor processor,
    SummarizationMode mode = SummarizationMode.Abstractive,
    CancellationToken cancellationToken = default(CancellationToken)
)

Function SummarizeAsync(
    processor As PdfDocumentProcessor,
    mode As SummarizationMode = SummarizationMode.Abstractive,
    cancellationToken As CancellationToken = Nothing
) As Task(Of String)

using DevExpress.AIIntegration.Docs;
using DevExpress.Drawing;
using DevExpress.Pdf;
using System.Drawing;

// See "Register AI extension service" section for implementation code
var docProcessingService = defaultAIExtensionsContainer.CreateAIDocProcessingService();

using var pdfDocumentProcessor = new PdfDocumentProcessor();
pdfDocumentProcessor.LoadDocument("Documents/FirstLookExported.pdf");
string summary = await docProcessingService.SummarizeAsync(
    pdfDocumentProcessor,
    SummarizationMode.Extractive,
    CancellationToken.None);

PdfPage page = pdfDocumentProcessor.InsertNewPage(1, PdfPaperSize.Letter);
    PdfRectangle pageSize = page.CropBox;
AddContentToPage(pdfDocumentProcessor, page, pageSize, summary);

pdfDocumentProcessor.SaveDocument("result.pdf");

// This method draws text on the inserted page
void AddContentToPage(PdfDocumentProcessor pdfDocumentProcessor, PdfPage page, 
    PdfRectangle pageSize, string text) {
    using (PdfGraphics graphics = pdfDocumentProcessor.CreateGraphicsWorldSystem())
    {
        using (var textBrush = new DXSolidBrush(Color.FromArgb(255, Color.DarkOrange)))
        {
            DXFont font = new DXFont("Segoe UI", 12, DXFontStyle.Regular);

            // Calculate text size
            SizeF textSize = graphics.MeasureString(text, font, new PdfStringFormat());

            // Calculate an area to draw the text
            PointF textPoint = new PointF(0, (float)(pageSize.Height - 10));
            RectangleF rectangle = new RectangleF(
                0, 10,
                (float)pageSize.Width,
                (float)(pageSize.Height / 2));

            // Draw text at the calculated area
            graphics.DrawString(text, font, textBrush, rectangle);
            graphics.AddToPageForeground(page);
        }
    }
}

Imports DevExpress.AIIntegration.Docs
Imports DevExpress.Drawing
Imports DevExpress.Pdf
Imports System.Drawing

Async Function Main() As Task

    ' See "Register AI extension service" section for implementation code
    var docProcessingService = defaultAIExtensionsContainer.CreateAIDocProcessingService()

    Using pdfDocumentProcessor As New PdfDocumentProcessor()
        pdfDocumentProcessor.LoadDocument("Documents/FirstLookExported.pdf")
        Dim summary As String = Await docProcessingService.SummarizeAsync( _
            pdfDocumentProcessor, _
            SummarizationMode.Extractive, _
            CancellationToken.None)

        Dim page As PdfPage = pdfDocumentProcessor.InsertNewPage(1, PdfPaperSize.Letter)
        Dim pageSize As PdfRectangle = page.CropBox
        AddContentToPage(pdfDocumentProcessor, page, pageSize, summary)

        pdfDocumentProcessor.SaveDocument("result.pdf")
    End Using
End Function

' This method draws text on the inserted page
Private Sub AddContentToPage(pdfDocumentProcessor As PdfDocumentProcessor, page As PdfPage, pageSize As PdfRectangle, text As String)
    Using graphics As PdfGraphics = pdfDocumentProcessor.CreateGraphicsWorldSystem()
        Using textBrush As New DXSolidBrush(Color.FromArgb(255, Color.DarkOrange))
            Dim font As New DXFont("Segoe UI", 12, DXFontStyle.Regular)

            ' Calculate text size
            Dim textSize As SizeF = graphics.MeasureString(text, font, New PdfStringFormat())

            ' Calculate an area to draw the text
            Dim textPoint As New PointF(0, CSng(pageSize.Height - 10))
            Dim rectangle As New RectangleF( _
                0, 10, _
                CSng(pageSize.Width), _
                CSng(pageSize.Height / 2))

            ' Draw text at the calculated area
            graphics.DrawString(text, font, textBrush, rectangle)
            graphics.AddToPageForeground(page)
        End Using
    End Using
End Sub

case PdfPart.WholeDocument:
    summaryText = await docProcessingService.SummarizeAsync(pdfDocumentProcessor, summarizationMode);
    break;