Sets or returns whether Excel will recommend - when the workbook is opened - that it be viewed in read-only mode.

public boolean ReadOnlyRecommended{ get; set; }
Public Property ReadOnlyRecommended() As Boolean
          //--- Get the ReadOnlyRecommended value for the workbook
          bool readOnlyRec = wb.ReadOnlyRecommended;

          //--- Set the ReadOnlyRecommended value for the workbook
          wb.ReadOnlyRecommended = true;
        
          '--- Get the ReadOnlyRecommended value for the workbook
          Dim readOnlyRec As Boolean = wb.ReadOnlyRecommended

          '--- Set the ReadOnlyRecommended value for the workbook
          wb.ReadOnlyRecommended = True