Sets or returns a boolean that represents whether or not Word will underline trailing spaces for this document.

public boolean UnderlineTrailingSpaces{ get; set; }
Public Property UnderlineTrailingSpaces() As Boolean

MS Word equivalent: Tools menu > Options... > Compatibility tab > Compatibility options for [filename].doc section > Options > Don't underline on trailing spaces

          //--- Return UnderlineTrailingSpaces
          bool underlineTrailingSpaces = cs.UnderlineTrailingSpaces;

          //--- Set UnderlineTrailingSpaces
          cs.UnderlineTrailingSpaces = true;
        
          '--- Return UnderlineTrailingSpaces
          Dim underlineTrailingSpaces As Boolean = cs.UnderlineTrailingSpaces

          '--- Set UnderlineTrailingSpaces
          cs.UnderlineTrailingSpaces = True