How do I insert hidden bookmarks to the document?

Essential DocIO supports to insert hidden bookmarks to the document. A bookmark text that will be inserted preceded with an underscore character [ _ ] is considered as hidden bookmark.

C#

// Indicating hidden bookmark text start.

paragraph.AppendBookmarkStart ( "_HiddenText" );

// Writing bookmark text

paragraph.AppendText ( "Hidden Bookmark Text" );

// Indicating hidden bookmark text end.

paragraph.AppendBookmarkEnd ( "_HiddenText" );

VB

' Indicating hidden bookmark text start.

paragraph.AppendBookmarkStart ("_HiddenText")

' Writing bookmark text

paragraph.AppendText ("Hidden Bookmark Text")

' Indicating hidden bookmark text end.

paragraph.AppendBookmarkEnd ("_HiddenText")

Here is the sample.

Hidden_Bookmark.zip