response.clear();
     response.buffer= true;
     response.charset="gb2312";
     response.appendheader("content-disposition","attachment;filename=filename.xls");
     response.contentencoding=system.text.encoding.getencoding("gb2312");
     //設置輸出流為簡體中文
     response.contenttype = "application/ms-excel";
     //設置輸出文件類型為excel文件。
     this.enableviewstate = false;
     system.globalization.cultureinfo mycitrad = new system.globalization.cultureinfo("zh-cn",true);
     system.io.stringwriter ostringwriter = new system.io.stringwriter(mycitrad);
     system.web.ui.htmltextwriter ohtmltextwriter = new system.web.ui.htmltextwriter(ostringwriter);
     datagrid1.rendercontrol(ohtmltextwriter);
     response.write(ostringwriter.tostring());
     response.end();

}