Sets or returns whether Microsoft Excel will automatically refresh a pivot table and the pivot table cache when Microsoft Excel opens the document.

 public boolean RefreshOnOpen{ get; set; }

Public Property RefreshOnOpen() As Boolean


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

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

RefreshOnOpen is false by default.