Determines whether the workbook can only be opened in read-only mode.

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

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

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