string dataDir = RunExamples.GetDataDir_Text();
            
// Create an object of the Document class
Document doc = new Document();
            
// Initialize Page class object
Aspose.Note.Page page = new Aspose.Note.Page(doc);
            
// Initialize Outline class object
Outline outline = new Outline(doc);

// Initialize TextStyle class object and set formatting properties
ParagraphStyle defaultStyle = new ParagraphStyle { FontColor = Color.Black, FontName = "Arial", FontSize = 10 };

// Initialize OutlineElement class objects and apply numbering
// Numbers in the same outline are automatically incremented.
OutlineElement outlineElem1 = new OutlineElement(doc) { NumberList = new NumberList("{0})", NumberFormat.DecimalNumbers, "Arial", 10) };
RichText text1 = new RichText(doc) { Text = "First", ParagraphStyle = defaultStyle };
outlineElem1.AppendChildLast(text1);

OutlineElement outlineElem2 = new OutlineElement(doc) { NumberList = new NumberList("{0})", NumberFormat.DecimalNumbers, "Arial", 10) };
RichText text2 = new RichText(doc) { Text = "Second", ParagraphStyle = defaultStyle };
outlineElem2.AppendChildLast(text2);

OutlineElement outlineElem3 = new OutlineElement(doc) { NumberList = new NumberList("{0})", NumberFormat.DecimalNumbers, "Arial", 10) };
RichText text3 = new RichText(doc) { Text = "Third", ParagraphStyle = defaultStyle };
outlineElem3.AppendChildLast(text3);

// Add outline elements
outline.AppendChildLast(outlineElem1);
outline.AppendChildLast(outlineElem2);
outline.AppendChildLast(outlineElem3);

// Add Outline node
page.AppendChildLast(outline);
// Add Page node
doc.AppendChildLast(page);

dataDir = dataDir + "ApplyNumberingOnText_out.one"; 
// Save OneNote document
doc.Save(dataDir);