简单的保证原样输出html的c#代码

 public string NoExcuteHtml(string Htmlstring)
    {
        string x = string.Empty;
        x = Htmlstring.Replace(@"&", "&");//将&设置为保留字
        x = x.Replace(@"<", "&lt;"); 
        x = x.Replace(@">", "&gt;");
        x = x.Replace(@" ", "&nbsp;");
        x = x.Replace("\r\n", "<br/>");
        return x;
    }