Excel.Application ThisApp = new Excel.Application();
            ThisApp.Workbooks.Add(Type.Missing);
            Excel.Workbook wb = ThisApp.ActiveWorkbook;
            Excel.Worksheet ws = (Excel.Worksheet)wb.Worksheets[1];

((Excel.Range)ws.Cells[1, 1]).Value2 = "";

            ThisApp.ActiveWorkbook.SaveAs(filename, Excel.XlFileFormat.xlExcel9795,
                Type.Missing, Type.Missing, Type.Missing, Type.Missing, Excel.XlSaveAsAccessMode.xlExclusive,
                Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);

            ThisApp.Quit();
            System.Runtime.InteropServices.Marshal.ReleaseComObject(ThisApp);