private static void InsertToc(DocumentBuilder builder)
{
// Creating TOC entries
builder.ParagraphFormat.StyleIdentifier = StyleIdentifier.Heading1;
builder.Writeln("Heading 1");
builder.ParagraphFormat.StyleIdentifier = StyleIdentifier.Heading2;
builder.Writeln("Heading 1.1");
builder.ParagraphFormat.StyleIdentifier = StyleIdentifier.Heading4;
builder.Writeln("Heading 1.1.1.1");
builder.ParagraphFormat.StyleIdentifier = StyleIdentifier.Heading5;
builder.Writeln("Heading 1.1.1.1.1");
builder.ParagraphFormat.StyleIdentifier = StyleIdentifier.Heading9;
builder.Writeln("Heading 1.1.1.1.1.1.1.1.1");
}