PdfEditorBookmarks Property

The outline of the document, displayed as bookmarks in the navigation panel of PDF viewers. The collection holds the bookmarks of the loaded document, which can be changed, removed or reordered, and the bookmarks added to it. The outline is written when the document is saved. The location in a page is given from the top left corner of the page. The outline of a signed document can be read but not changed

public PdfBookmarkCollection Bookmarks { get; }