数据库中下载文件

    private void write()
    {

        DMessage dmes = new DMessage();
        Message mes = new Message();
        mes = dmes.GetModel(Convert.ToInt32(ViewState["ID"]));
        string filename = Server.UrlEncode("附件");
        Byte[] b = mes.Annex;
   
        //Response.ContentType = "Application/msword";
        //word 
        Response.ContentType = "application/octet-stream";

        Response.AddHeader("Content-Disposition", "attachment;   filename=" + HttpUtility.UrlEncode("附件", System.Text.Encoding.Unicode));
        this.Response.Clear();
        System.IO.Stream fs = this.Response.OutputStream;
        fs.Write(b, 0, b.Length);
        fs.Close();
        this.Response.End();

    }