string filename = Server.MapPath("../file1/") + "book2.xls";
            ThisApplication = new Microsoft.Office.Interop.Excel.Application();
            m_objBooks = (Microsoft.Office.Interop.Excel.Workbooks)ThisApplication.Workbooks;
            ThisWorkbook = (Microsoft.Office.Interop.Excel._Workbook)(m_objBooks.Add(Type.Missing));
            ThisApplication.DisplayAlerts = false;
            this.DeleteSheet();
            this.AddDatasheet();
            this.LoadData();
            Microsoft.Office.Interop.Excel.Chart xlChart = (Microsoft.Office.Interop.Excel.Chart)ThisWorkbook.Charts.Add(Type.Missing, xlSheet, Type.Missing, Type.Missing);
            Microsoft.Office.Interop.Excel.Range cellRange = xlSheet.get_Range("A1", "B9");

ThisApplication.Visible = false;
            ThisWorkbook.SaveAs(filename, XlFileFormat.xlXMLSpreadsheet, Type.Missing, Type.Missing, false, false, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
            Page.ClientScript.RegisterStartupScript(Page.GetType(), "", "<script>alert('success!')</script>");

在网上COPY了人家的代码，看网上好多都是用的这种方法，可是我为什么结果却看不到图表呢，没有错误，就是只看数据，没有图表，请各位高手指教