求解asp.net ajax框架下Scriptmanager控件中Response的问题

本人需要从GridView导出Excel表格 ,以下是导出部分的代码

public static void DataGridToExcel(GridView dg, Page page)
    {
        page.Response.Clear();
        page.Response.Buffer = true;
        page.Response.Charset = "GB2312";
        string str = "生成的电子表格.xls";
        page.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(str, Encoding.UTF8));
        page.Response.ContentEncoding = Encoding.GetEncoding("GB2312");
        page.Response.ContentType = "application/ms-excel";
        page.EnableViewState = false;
        CultureInfo formatProvider = new CultureInfo("ZH-CN", true);
        StringWriter writer = new StringWriter(formatProvider);
        HtmlTextWriter writer2 = new HtmlTextWriter(writer);
        dg.RenderControl(writer2);
        page.Response.Write(writer.ToString());
        page.Response.End();
        dg.AllowPaging = true;
        dg.DataBind();

    }
在普通页面上，一切正常，可以正常导出Excel文件。
当此页面加入到Ajax框架中，使用Scriptmanager控件和updatepanel控件以后，页面出现Response相关的错误，


请高手指教如何解决Scriptmanager与页面输出的矛盾！