/// <summary>
/// Renders a Table of Contents (TOC) in front of the document.
///
/// Please set the paragraphs style to "Heading{#}".
/// Otherwise, it renders an empty TOC.
/// </summary>
private void RenderTOC()
{
TOC tocBuilder = new TOC();
CT_SdtBlock tableOfContents = tocBuilder.Build();
CT_P pHeader = CreateFrontHeader();
newDoc.Document.body.Items.Add(tableOfContents);
newDoc.Document.body.Items.Add(pHeader);
newDoc.CreateParagraph().CreateRun().AddBreak(BreakType.PAGE);
newDoc.EnforceUpdateFields();
}