private static void DownLoadExcel(string path,Page  page)
        {
    System.IO.FileInfo file = new System.IO.FileInfo(path);
    page.Response.Clear();
    page.Response.Charset = "GB2312";
    page.Response.ContentEncoding = System.Text.Encoding.ASCII;
    //page.Response.ContentEncoding = System.Text.Encoding.UTF8;
    page.Response.AddHeader("Content-Disposition", "attachment; filename=" + page.Server.UrlEncode(file.Name));
    page.Response.AddHeader("Content-Length", file.Length.ToString());
    page.Response.ContentType = "application/ms-excel";
    page.Response.WriteFile(file.FullName);
    page.Response.Flush();
    page.Response.End();
 }