代码解释！专业人士请进！

小弟新手，请多关照，跪谢，在线等！
protected string showrely(bool isrely, string rebody)
    {
        if (isrely)
        {
            return "<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font color='#2CB421'>管理员回复:&nbsp;&nbsp;</font><font color='#000099'>" + Server.HtmlEncode(rebody) + "</font>";
        }
        else
        {
            return null;
        }
    }

    protected string showbody(bool ishidden, string str_body)
    {
        if (!ishidden || Session["admin"] != null)
        {
            return str_body.Replace("\r\n", "<br>");

        }

        else
        {
            return "<br>&nbsp;&nbsp;<font color=red>此留言为悄悄话!只有管理员可见!</font>";
        }
    }