动态修改页面标题,关键字及描述等信息

                HtmlHead head = this.Header;//获得Head标记 
                head.Title = dr["web_title"].ToString(); 

                HtmlMeta WebKeyWords = new HtmlMeta();//创建Meta标记 
                WebKeyWords.Name = "KeyWords";
                WebKeyWords.Content = dr["web_keywords"].ToString();

                head.Controls.Add(WebKeyWords); //向head里添加Meta 

                HtmlMeta WebDescription = new HtmlMeta();
                WebDescription.Name = "Description";
                WebDescription.Content = dr["web_description"].ToString();

                head.Controls.Add(WebDescription);