Refreshing an Excel Pivot table from C#

Question

I am trying to refresh a pivot table in an Excel sheet and get the following exception:

Item method in the PivotTables class failed

Heres t

Answer 1

private void RefreshSheets(string filePath)
    {
        Excel.Application xlApp = new Excel.Application();
        Excel.Workbooks xlWorkbooks = xlApp.Workbooks;
        Excel.Workbook xlWorkbook = xlWorkbooks.Open(filePath);

        foreach (Excel.Worksheet xlworksheet in xlWorkbook.Worksheets)
        {
            Excel.PivotTables pivotTbls = (Excel.PivotTables)xlworksheet.PivotTables(Type.Missing);
            if (pivotTbls.Count > 0)
            {
                for (int i = 1; i <= pivotTbls.Count; j++)
                {
                    pivotTbls.Item(i).RefreshTable();
                }
            }
        }
        xlWorkbook.Save();
        GC.Collect();
        GC.WaitForPendingFinalizers();
        xlWorkbook.Close(0);
        Marshal.ReleaseComObject(xlWorkbook);
        Marshal.ReleaseComObject(xlWorkbooks);
        xlApp.Quit();
        Marshal.ReleaseComObject(xlApp);
    }

Add using Excel = Microsoft.Office.Interop.Excel; in using