asp.net导出Excel

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 protected void CreateExcel(DataSet ds, string typeid, string FileName)    {        HttpResponse resp;        resp = Page.Response;        resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");        resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);        resp.Charset = "UTF-8";

        string colHeaders = "", ls_item = "";        int i = 0;

        //定义表对象与行对像，同时用DataSet对其值进行初始化        DataTable dt = ds.Tables[0];        DataRow[] myRow = dt.Select("");        // typeid=="1"时导出为EXCEL格式文件；typeid=="2"时导出为XML格式文件        if (typeid == "1")        {

            resp.ContentType = "application/ms-excel";//image/JPEG;text/HTML;image/GIF;vnd.ms-excel/msword            //取得数据表各列标题，各标题之间以\t分割，最后一个列标题后加回车符            for (i = 0; i < dt.Columns.Count - 1; i++)                colHeaders += dt.Columns[i].Caption.ToString() + "\t";            colHeaders += dt.Columns[i].Caption.ToString() + "\n";            //向HTTP输出流中写入取得的数据信息            resp.Write(colHeaders);            //逐行处理数据              foreach (DataRow row in myRow)            {                //在当前行中，逐列获得数据，数据之间以\t分割，结束时加回车符\n                for (i = 0; i < dt.Columns.Count - 1; i++)                    ls_item += row[i].ToString().Replace("\t", "") + "\t";                ls_item += row[i].ToString().Replace("\t", "") + "\n";                //当前行数据写入HTTP输出流，并且置空ls_item以便下行数据                    resp.Write(ls_item);                ls_item = "";            }        }        else        {            if (typeid == "2")            {                //从DataSet中直接导出XML数据并且写到HTTP输出流中                resp.Write(ds.GetXml());            }        }        //写缓冲区中的数据到HTTP头文件中        resp.End();    }

//绑定事件

protected void ExcelBind()    {        string sel = "select OrderName as '姓名',OrderTel as '电话' ,convert(nvarchar(10),OrderDate,120 ) as '日期' ,OrderType_id as '产品' ,OrderMark as '备注' from BuyOrder ";                      conn.Open();        cmd = new SqlCommand(sel, conn);        SqlDataAdapter da = new SqlDataAdapter(cmd);        DataSet ds = new DataSet();        da.Fill(ds);        conn.Close();
        CreateExcel(ds, "1", "Statement.xls");//引用上面的方法进行另存为    }