// Create a pdf document
PdfDocument pdf = new PdfDocument();

// Create a content builder
PdfContentBuilder builder = new PdfContentBuilder(pdf);

// Add the first section
var s1 = builder.AddSection();
s1.AddHeading1("Section One");
s1.AddParagraph("First flowing paragraph.");

// Add the second section
var s2 = builder.AddSection();
s2.AddHeading1("Section Two");
s2.AddParagraph("Second flowing paragraph.");

// Add the third section (paragraph only)
var s3 = builder.AddSection();
s3.AddParagraph("Third section, only a paragraph.");

// Add the fourth section with headings and navigation entries
var s4 = builder.AddSection();
var h1 = s4.AddHeading(1, "Alpha Chapter");
var h2 = s4.AddHeading(2, "Beta Section");
var h3 = s4.AddHeading(3, "Gamma Subsection");
h1.AsNavigationEntry("Alpha Chapter", 1);
h2.AsNavigationEntry("Beta Section", 2);
h3.AsNavigationEntry("Gamma Subsection", 3);
s4.AddParagraph("Body copy under the headings.");

// Build the document
var result = builder.Build();

// Save the document
String outputFile = "Bug_1_MultipleSections.pdf";
pdf.SaveToFile(outputFile);
pdf.Close();

PdfDocument doc = new PdfDocument();
PdfPageBase page = doc.Pages.Add();
RectangleF rect = new RectangleF(140, 689, 80, 1);
PdfLineAnnotation lineAnnotation = new PdfLineAnnotation(page, rect, new PointF(140, 690), new PointF(220, 690));
lineAnnotation.Contents = "This is the first line annotation";
// New way
PdfAnnotationCollection anmotationCollection = PdfAnnotationCollection.Create(page);
anmotationCollection.Add(lineAnnotation);
// Old way
//page.AnnotationsV2.Add(lineAnnotation);