导出gridview到excel中的关键之处
用法： toexcel(gvstaff, textbox1.text);

public static void toexcel(system.web.ui.control ctl,string filename)
        {
            httpcontext.current.response.charset ="utf-8";
            httpcontext.current.response.contentencoding =system.text.encoding.default;
            httpcontext.current.response.contenttype ="application/ms-excel";
            httpcontext.current.response.appendheader("content-disposition","attachment;filename="+""+filename+".xls");
            ctl.page.enableviewstate =false;
            system.io.stringwriter  tw = new system.io.stringwriter();
            htmltextwriter hw = new htmltextwriter(tw);
            ctl.rendercontrol(hw);
            httpcontext.current.response.write(tw.tostring());
            httpcontext.current.response.end();
        }       
    
必须有下面这句！否则不会通过！
public override void verifyrenderinginserverform(control control)
    {
        // confirms that an htmlform control is rendered for
    }

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