public string Tohtml(string zifu)
        {
            string noStyle = zifu.Replace("&quot;", "\"").Replace("&lt;", "<").Replace("&gt;", ">").Replace("&quot;", "\"").Replace("&nbsp;", "");
            noStyle = Regex.Replace(noStyle, @"<[\w\W]*?>", "",
           RegexOptions.IgnoreCase);
            noStyle = Regex.Replace(noStyle, @"\s", "",
          RegexOptions.IgnoreCase);
            return noStyle;
        }