Sets or returns whether Microsoft Excel will automatically show a caption in place of a empty cell.

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

          ExcelApplication xla = new ExcelApplication();
          Workbook wb = xla.Open(@"C:\MySpreadsheet.xlsx");
          Worksheet ws = wb.Worksheets[0];
          ws.PivotTables[0].PivotTableSettings.ShowEmptyValueCaption= true;

          Dim xla As New ExcelApplication()
          Dim wb As Workbook = xla.Open("C:\MySpreadsheet.xlsx")
          Dim ws As Worksheet = wb.Worksheets(0)
          ws.PivotTables(0).PivotTableSettings.ShowEmptyValueCaption= true;

While ShowEmptyValueCaption is true by default, EmptyValueCaption also needs to be set.