Hi Vincent

In VBA you can use something like this:

Dim oDoc As Word.Document
Dim bm As Word.Bookmark

   Set oDoc = Word.ActiveDocument

   For Each bm In oDoc.Bookmarks
       Debug.Print bm.Name
   Next bm

I'll leave you to translate to C#.

You might like to know that Word accumulates hidden bookmarks as it goes
about its work. And a user or developer might have created a hidden
bookmark. You can see them at Insert > Bookmark, by ticking the hidden
bookmarks box.

If you only want to show the unhidden bookmarks, try something like this:

Dim oDoc As Word.Document
Dim bm As Word.Bookmark
Dim bWasHiddenBookmarks as Boolean

   Set oDoc = ActiveDocument

   bWasHiddenBookmarks = oDoc.Bookmarks.ShowHidden
   oDoc.Bookmarks.ShowHidden = False

   For Each bm In oDoc.Bookmarks
       Debug.Print bm.Name
   Next bm

   oDoc.Bookmarks.ShowHidden = bWasHiddenBookmarks

Hope this helps.

Shauna Kelly.  Microsoft MVP.
http://www.shaunakelly.com/word