菜鸟，请教linq问题...
我有个方法，base64解码后得到的字符串是xml格式的内容：如下

C# code

<args token="1">  <username>hyby_zhangzhen</username>  <password>*********</password>  <syncid>hyby_zhangzhen</syncid></args>

我想问下，我用linq如何判断<username>是否有值，还要如何把这三条数据的值取出来来呢， 谢谢，用linq

[解决办法]

C# code

    XDocument xmlDoc = XDocument.Parse(@"<args token=""1"">  <username>hyby_zhangzhen</username>  <password>*********</password>  <syncid>hyby_zhangzhen</syncid></args>");    var q = from c in xmlDoc.Descendants("args")            where c.Attribute("token").Value == "1"            select new            {              username = c.Element("username"),              password = c.Element("password"),              syncid = c.Element("syncid")            };    foreach (var item in q)    {      Response.Write("<li>" + item.username.Name + ": " + item.username.Value);      Response.Write("<li>" + item.password.Name + ": " + item.password.Value);      Response.Write("<li>" + item.syncid.Name + ": " + item.syncid.Value);    }