简单实用的.net DataTable导出Execl

    protected void btnprint_click(object sender, eventargs e)
    {
        string strpath = "mfout" + datetime.now.tostring("yyyymmddhhmmssfff") + ".xls";
        datagrid dg = new datagrid();
        dg.datasource = dtmain;
        dg.databind();
        response.clear();
        response.addheader("content-disposition", "attachment;filename=" + strpath + "");
        response.charset = "gb2312";
        response.contentencoding = system.text.encoding.utf8;//不设置会有乱码
        response.contenttype = "application/vnd.xls";
        system.io.stringwriter stringwrite = new system.io.stringwriter();
        system.web.ui.htmltextwriter htmlwrite = new htmltextwriter(stringwrite);
        dg.rendercontrol(htmlwrite);
        response.write(stringwrite.tostring());
        response.end();
    }
    public override void verifyrenderinginserverform(control control)
    {
        //这个方法不能删除掉 导出时要用到，不然会报错：
        //类型“gridview”的控件“ctl00_contentplaceholder1_gridview1”必须放在具有 runat=server 的窗体标记内
    }