protected void btnChangeClicked(object sender, EventArgs e)
    {
        var data = new StuAskReply();

        data.reply_date = DateTime.Now;
        data.ask_id     = Request.QueryString["id"].AsInt();
        data.code       = Session["login_code"].AsString();
        data.role       = Session["login_role"].AsString();
        data.content    = content.Text;

        //保存图片START
        string url      = "/Upload/Photo/";
        string fileName = FileUpload2.SaveFile(Server.MapPath(url));

        if (!string.IsNullOrEmpty(fileName))
        {
            data.imageUrl = url + fileName;
        }

        Sql.Insert(data);
        this.ShowAlert("回复成功", "StuAskView.aspx?id=" + data.ask_id.AsString());
    }