// Create a document.
    using( var document = DocX.Create( "InsertBookmarks.docx" ) )
    {
      // Insert a bookmark in the document.
      document.InsertBookmark( "Bookmark1" );
      // Add a paragraph.
      var p = document.InsertParagraph( "This document contains a bookmark named \"" );
      p.Append( document.Bookmarks.First().Name );
      p.Append( "\" just before this line." );        
      // Save the document.
      document.Save();
    }