asp.net数据集导出excel表

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        SqlConnection con = new SqlConnection(System.Web.Configuration.WebConfigurationManager.ConnectionStrings["carConnectionString"].ToString());
        {
            string cmd1 = "select * from trytable";
            SqlDataAdapter da = new SqlDataAdapter(cmd1, con);
            DataSet ds = new DataSet();//创建数据集
            da.Fill(ds);//填充数据集
            DataTable dt = ds.Tables[0];

            GridView gvOrders = new GridView();
            Response.Clear();
            Response.ContentType = "application/vnd.ms-excel";
            Response.Charset = "GB2312";
            Response.AppendHeader("Content-Disposition", "attachment;filename=PhenixUpdateDataLog.xls");
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312"); //设置输出流为简体中文
            this.EnableViewState = false;
            Response.Write("<meta http-equiv=Content-Type content=\"text/html; charset=GB2312\">");
            System.IO.StringWriter sw = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(sw);
            gvOrders.AllowPaging = false;
            gvOrders.AllowSorting = false;
            gvOrders.DataSource = dt;
            gvOrders.DataBind();
            gvOrders.RenderControl(hw);
            Response.Write(sw.ToString());
            Response.End();

}