Bookmark RemoveAt Function. Remove the Bookmark at the specified location. ABCpdf .NET PDF Library. From ABCpdf .net previous page next page RemoveAt Method Remove the Bookmark at the specified location. Syntax [C#]void RemoveAt(int index)[Visual Basic]Sub RemoveAt(index As Integer) Params Name Description index The zero based index specifying the Bookmark to be removed. Notes Use this method to remove the Bookmark at the specified location. The Bookmarks that follow the removed Bookmark move up to occupy the empty spot. Example None. previous page start next page