DataSet 读取xml 报错有非法字符

private void Bind()
        {
            string strLogPath = ConfigurationSettings.AppSettings["LOG_PATH"].ToString();
            if (strLogPath.Length > 0 && strLogPath[strLogPath.Length - 1] != ‘\\‘)
                strLogPath += ‘\\‘;

            string strXMLUrl = String.Format("{0}{1}.xml", strLogPath, DateTime.Now.ToString("yyyyMMdd"));

            string xmlContent = Common.Library.ReadFileAbsolute(strXMLUrl, ASCIIEncoding.GetEncoding("GB2312")).Replace("\r\n", "");

            StringReader strReader = new StringReader(xmlContent);
            DataSet ds = new DataSet();
            ds.ReadXml(strReader);
            DataTable dt = ds.Tables["item"];
        }