asp.net 输出Excel

        private void lbtExportToExcel_Click(object sender, EventArgs e)
        {
            string strdate = DateTime.Now.Month.ToString() + "/" + DateTime.Now.Day.ToString() + "/" + DateTime.Now.Year.ToString();
            strdate = (Convert.ToDateTime(strdate)).ToString("MMddyyyy");
            string strFileName = "Organic Loyalist Summary Report " + strdate + ".xls";
            StringWriter sw = new StringWriter();
            string str = "field\t" + "smaple data";
            sw.WriteLine(str);
            str = "Personally Enrolled Organic Loyalists:\t" + this.lblPEOLoyalists.Text;
            sw.WriteLine(str);
            str = "Number of Organic Loyalists in Downline:\t" + this.lblNOOLInDowline.Text;
            sw.WriteLine(str);
            str = "Organic Loyalists Sales:\t" + this.lblOLSales.Text;
            sw.WriteLine(str);
            sw.Close();
            System.Web.HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + strFileName);
            System.Web.HttpContext.Current.Response.ContentType = "application/ms-excel";
            System.Web.HttpContext.Current.Response.Write(sw);
            System.Web.HttpContext.Current.Response.End();
        }