Aspose.PDF for .NET 25.5

    // For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
    private static void ExtractCertificate()
    {
        // The path to the documents directory
        var dataDir = RunExamples.GetDataDir_AsposePdf_SecuritySignatures();

        // Open PDF document
        using (var document = new Aspose.Pdf.Document(dataDir + "ExtractSignatureInfo.pdf"))
        {
            using (var signature = new Aspose.Pdf.Facades.PdfFileSignature(document))
            {
                // Get signature names
                var signatureNames = signature.GetSignatureNames();
                foreach (var signatureName in signatureNames)
                {
                    // Extract certificate
                    X509Certificate2 certificate;
                    if (signature.TryExtractCertificate(signatureName, out certificate))
                    {
                        Console.WriteLine(certificate.SerialNumber);
                    }
                }
            }
        }
    }

    // For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
    private static void CreateOrderedList()
    {
        // The path to the documents directory
        var dataDir = RunExamples.GetDataDir_AsposePdf_WorkingDocuments();

        // Create or open PDF document
        using (var document = new Document())
        {
            ITaggedContent content = document.TaggedContent;
            StructureElement rootElement = content.RootElement;

            content.SetLanguage("en-US");

            ListElement rootList = content.CreateListElement();

            SpanElement spanForLbl_1 = content.CreateSpanElement();
            spanForLbl_1.SetText("1. ");
            spanForLbl_1.AdjustPosition(new PositionSettings
            {
                IsInLineParagraph = true
            });
            SpanElement spanForBody_1 = content.CreateSpanElement();
            spanForBody_1.SetText("bread");
            spanForBody_1.AdjustPosition(new PositionSettings
            {
                IsInLineParagraph = true
            });

            ListLblElement lbl_1 = content.CreateListLblElement();
            lbl_1.AppendChild(spanForLbl_1);    
            ListLBodyElement lBody_1 = content.CreateListLBodyElement();
            lBody_1.AppendChild(spanForBody_1);

            ListLIElement li_1 = content.CreateListLIElement();
            li_1.AppendChild(lbl_1);
            li_1.AppendChild(lBody_1);
            rootList.AppendChild(li_1);

            SpanElement spanForLbl_2 = content.CreateSpanElement();
            spanForLbl_2.SetText("2. ");
            SpanElement spanForBody_2 = content.CreateSpanElement();
            spanForBody_2.SetText("milk");
            spanForBody_2.AdjustPosition(new PositionSettings
            {
                IsInLineParagraph = true,
            });

            ListLblElement lbl_2 = content.CreateListLblElement();
            lbl_2.AppendChild(spanForLbl_2);
            ListLBodyElement lBody_2 = content.CreateListLBodyElement();
            lBody_2.AppendChild(spanForBody_2);

            ListLIElement li_2 = content.CreateListLIElement();
            li_2.AppendChild(lbl_2);
            li_2.AppendChild(lBody_2);
            rootList.AppendChild(li_2);

            ListElement nestedListDepth1 = content.CreateListElement();
            SpanElement spanForLbl_3_1 = content.CreateSpanElement();
            spanForLbl_3_1.SetText("3.1. ");
            spanForLbl_3_1.AdjustPosition(new PositionSettings
            {
                IsInLineParagraph = false,
                Margin = new MarginInfo
                {
                    Left = 50
                }
            });
            SpanElement spanForBody_3_1 = content.CreateSpanElement();
            spanForBody_3_1.SetText("apples");
            spanForBody_3_1.AdjustPosition(new PositionSettings
            {
                IsInLineParagraph = true,
            });

            ListLblElement lbl_3_1 = content.CreateListLblElement();
            lbl_3_1.AppendChild(spanForLbl_3_1);
            ListLBodyElement lBody_3_1 = content.CreateListLBodyElement();
            lBody_3_1.AppendChild(spanForBody_3_1);

            ListLIElement li_3_1 = content.CreateListLIElement();
            li_3_1.AppendChild(lbl_3_1);
            li_3_1.AppendChild(lBody_3_1);
            nestedListDepth1.AppendChild(li_3_1);

            SpanElement spanForLbl_3_2 = content.CreateSpanElement();
            spanForLbl_3_2.SetText("3.2. ");
            spanForLbl_3_2.AdjustPosition(new PositionSettings
            {
                IsInLineParagraph = false,
                Margin = new MarginInfo
                {
                    Left = 50
                }
            });
            SpanElement spanForBody_3_2 = content.CreateSpanElement();
            spanForBody_3_2.SetText("banana");
            spanForBody_3_2.AdjustPosition(new PositionSettings
            {
                IsInLineParagraph = true,
            });

            ListLblElement lbl_3_2 = content.CreateListLblElement();
            lbl_3_2.AppendChild(spanForLbl_3_2);
            ListLBodyElement lBody_3_2 = content.CreateListLBodyElement();
            lBody_3_2.AppendChild(spanForBody_3_2);

            ListLIElement li_3_2 = content.CreateListLIElement();
            li_3_2.AppendChild(lbl_3_2);
            li_3_2.AppendChild(lBody_3_2);
            nestedListDepth1.AppendChild(li_3_2);

            SpanElement spanForLbl_3 = content.CreateSpanElement();
            spanForLbl_3.SetText("3. ");
            SpanElement spanForBody_3 = content.CreateSpanElement();
            spanForBody_3.SetText("fruits");
            spanForBody_3.AdjustPosition(new PositionSettings
            {
                IsInLineParagraph = true
            });

            ListLblElement lbl_3 = content.CreateListLblElement();
            lbl_3.AppendChild(spanForLbl_3);
            ListLBodyElement lBody_3 = content.CreateListLBodyElement();
            lBody_3.AppendChild(spanForBody_3);

            ListLIElement li_3 = content.CreateListLIElement();
            li_3.AppendChild(lbl_3);
            li_3.AppendChild(lBody_3);
            lBody_3.AppendChild(nestedListDepth1);
            rootList.AppendChild(li_3);

            rootElement.AppendChild(rootList);

            // Save Tagged PDF Document
            document.Save(dataDir + "OrderedList_out.pdf");
        }
    }

    // For complete examples and data files, visit https://github.com/aspose-pdf/Aspose.PDF-for-.NET
    private static bool VerifyWithPublicKeyCertificate1(X509Certificate2 certificate, string inputPdfFilePath)
    {
        // Create an instance of PdfFileSignature for working with signatures in the document
        using (var fileSign = new Aspose.Pdf.Facades.PdfFileSignature(inputPdfFilePath))
        {
            // Get a list of signatures
            IList<Aspose.Pdf.Facades.SignatureName> signatureNames = fileSign.GetSignatureNames();
        
            // Verify the signature with the given name.
            return fileSign.VerifySignature(signatureNames[0], certificate);
        }
    }

    // For complete examples and data files, please go to https://github.com/aspose-pdf/Aspose.PDF-for-.NET
    private static void ConvertXFAFormWithIgnoreNeedsRendering()
    {
        // The path to the documents directory.
        string dataDir = RunExamples.GetDataDir_AsposePdf_Forms();

        // Load dynamic XFA form
        using (var document = new Aspose.Pdf.Document(dataDir + "DynamicXFAToAcroForm.pdf")) 
        {
            //check if XFA is present & if rendering should be overwritten
            if (!doc.Form.NeedsRendering && doc.Form.HasXfa)
            {
                doc.Form.IgnoreNeedsRendering = true;
            }

            // Set the form fields type as standard AcroForm
            document.Form.Type = Aspose.Pdf.Forms.FormType.Standard;

            // Save the resultant PDF
            document.Save(dataDir + "Standard_AcroForm_out.pdf");
        }
    }

    // Create XpsSaveOptions instance
    XpsSaveOptions xpsSaveOptions = new XpsSaveOptions();
    // UseEmbeddedTrueTypeFonts option specifies whether to use embedded TrueType fonts
    xpsSaveOptions.UseEmbeddedTrueTypeFonts = false;
    // The specified default font will be used if the embedded font name cannot be found in the system
    xpsSaveOptions.DefaultFont = "Courier New";

    // Open PDF document
    Document doc = new Document(inputPath);
    // Save the resultant XPS
    doc.Save(outPath, xpsSaveOptions);