asp.net response写文件

   protected void Button2_Click(object sender, EventArgs e)
    {      
      bool ok = true;
       string fileName;
        fileName = DateTime.Now.ToString("yyyyMMddHHmmss") + ".doc";
        try
        {
            Response.ClearHeaders();
            Response.ContentType = "application/msword;";
            Response.Charset = "UTF-8";
            Response.AddHeader("Content-Disposition", string.Format("attachment;filename=\"{0}\"", fileName));
            Response.BinaryWrite(Encoding.Default.GetBytes(strr));
        }
        catch (Exception ex)
        {
            ok = false;
            Response.Write("生成文件失败：" + ex.Message + "，请稍后再试。");
            CreateGbpt(fileName, strr);
        }
        if (ok)
        {
            Response.End();
        }
   }
  private void CreateFile(string fileName, string text)
    {
        bool ok = true;
        string filePath;
  &