public void ChangeStyleOfTOCLevel()
{
Document doc = new Document();
//ExStart
//ExId:ChangeTOCStyle
//ExSummary:Changes a formatting property used in the first level TOC style.
// Retrieve the style used for the first level of the TOC and change the formatting of the style.
doc.Styles[StyleIdentifier.Toc1].Font.Bold = true;
//ExEnd
}