Document doc = new Document();
Paragraph paragraph = doc.AddSection().AddParagraph();
Chart chart = paragraph.AppendChart(ChartType.Column, 450, 300).Chart;
//Modify 'Series 3' to a line chart and display it on the secondary axis
chart.ChangeSeriesType("Series 3", ChartSeriesType.Line, true);
Console.WriteLine(chart.Series[2].ChartType);
doc.SaveToFile("ComboChart.docx");

Document document = new Document();
//Set default replacement font
doc.DefaultSubstitutionFontName = "Arial";
Section sec = doc.AddSection();
Paragraph para = sec.AddParagraph();
TextRange tr = para.AppendText("test");
//The system does not have this font
tr.CharacterFormat.FontName = "Helvetica";
doc.SaveToFile(outputFile, FileFormat.PDF);
doc.Close();

// Process inline structure tags
List<StructureDocumentTagInline> tagInlines = structureTags.getM_tagInlines();
for (int i = 0; i < tagInlines.Count; i++)
{
    tagInlines[i].RemoveSelfOnly();
}

// Process other structure tags
List<StructureDocumentTag> tags = structureTags.getM_tags();
for (int i = 0; i < tags.Count; i++)
{
    tags[i].RemoveSelfOnly();
}

// Process StructureDocumentTagRow
List<StructureDocumentTagRow> rowtags = structureTags.getM_rowtags();
for (int i = 0; i < rowtags.Count; i++)
{
    rowtags[i].RemoveSelfOnly();
}

// Process StructureDocumentTagCell
List<StructureDocumentTagCell> celltags = structureTags.getM_celltags();
for (int i = 0; i < celltags.Count; i++)
{
    celltags[i].RemoveSelfOnly();
}

Document document = new Document();
document.LoadFromFile(@"Sample.docx");
ToPdfParameterList para = new ToPdfParameterList();
para.PdfImageCompression = Spire.Doc.Export.PdfImageCompression.Jpeg;
document.SaveToFile(outputFile,para);

Document document = new Document();
Section section = doc.AddSection();

foreach (string ommlCode in OmmlCodes)
{
    OfficeMath officeMath = new OfficeMath(doc);
    officeMath.CharacterFormat.FontSize = 14f;
    officeMath.FromOMMLCode(ommlCode);
    section.AddParagraph().ChildObjects.Add(officeMath);
}

doc.SaveToFile(outputFile, FileFormat.Docx2013);
doc.Dispose();

Document document = new Document();
doc.LoadFromFile(inputFile);

StringBuilder stringBuilder = new StringBuilder();
// Iterate through sections in the document
foreach (Section section in doc.Sections)
{
    // Iterate through paragraphs in each section
    foreach (Paragraph par in section.Body.Paragraphs)
    {
        // Iterate through child objects in each paragraph
        foreach (DocumentObject obj in par.ChildObjects)
        {
            // Check if the object is an OfficeMath equation
            OfficeMath omath = obj as OfficeMath;
            if (omath == null) continue;
            // Convert OfficeMath equation to LaTex code
            string mathml = omath.ToLaTexMathCode();
            // Append MathML code to the StringBuilder
            stringBuilder.Append("LaTeX code" + mathml);
            stringBuilder.Append("\r\n");
        }
    }
}
// Write the LaTex code to a text file
File.WriteAllText(outputFile, stringBuilder.ToString())