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        protected override void Render(System.Web.UI.HtmlTextWriter writer)
        {
            StringWriter sw = new StringWriter() ;
            HtmlTextWriter htmlWriter = new HtmlTextWriter(sw) ;
            base.Render(htmlWriter) ;
            //µ±Ç°Óû§Ñ¡ÔñµÄ·ç¸ñcss
            string css = "<link href=\"css url\" rel=\"stylesheet\" type=\"text/css\">" ;
            string html = sw.ToString() ;
            int startPoint = html.IndexOf("</head>", StringComparison.CurrentCultureIgnoreCase);
            if (startPoint > 0)
            {
                html = html.Insert(startPoint, css);
            }
            writer.Write(html) ;
        }
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