c# txt代码转换成HTML格式

  /// <summary>        /// 字符串字符处理        /// </summary>        /// <param name="chr">等待处理的字符串</param>        /// <returns>处理后的字符串</returns>        /// //把TXT代码转换成HTML格式        public static String ToHtml(string Input)        {            StringBuilder sb = new StringBuilder(Input);            sb.Replace("&", "&amp;");            sb.Replace("<", "&lt;");            sb.Replace(">", "&gt;");            sb.Replace("\r\n", "<br />");            sb.Replace("\n", "<br />");            sb.Replace("\t", " ");            //sb.Replace(" ", "&nbsp;");            return sb.ToString();        }