asp.net动态添加link标记

//添加：
Header.Controls.Add(GroupManager.GetStyleLink(g.Style));

public static HtmlLink GetStyleLink(int style)
        {
            HtmlLink link = new HtmlLink();
            link.Attributes.Add("rel", "stylesheet");
            link.Attributes.Add("type", "text/css");
            link.Attributes.Add("media", "all");
            link.Href = "http://www***.com/css/group.css";

            return link;
        }

//修改：
<span id="spExam" runat="server"></span>

 spExam.Attributes["Style"]="display:none";