c#的 linq to xml问题

    XElement xxcc = XElement.Load("信息存储.xml");
    IEnumerable<XElement> elements = from ele in xxcc.Elements("root")//无法引用非静态变量
                                           select ele;
    string text = from t in xxcc.Descendants("conf");

            出现了错误

string text = from t in xxcc.Descendants("conf");
->
string text = (from t in xxcc.Descendants("conf") select t).First().ToString();