Need help with LINQ to XML in silverlight (instead of nodelist)

namespace WindowsFormsApplication12

{

    public partial class QuestionForm : Form

    {

        XmlNodeList nl;

        XmlNode nd1;

        XmlNode nd2;

        public QuestionForm(XmlNodeList nl)

        {

            InitializeComponent();

            this.nl = nl;

            Ask();

        }

        private void Ask()

        {            

            nd1 = nl[0];

            string question1 = nd1.Attributes["question"].Value;

            button1.Text = question1;

            nd2 = nl[1];

            string question2 = nd2.Attributes["question"].Value;

            button2.Text = question2;    

        }

        private void button1_Click(object sender, EventArgs e)

        {

            nl = nd1.ChildNodes;

            Ask();

        }

        private void button2_Click(object sender, EventArgs e)

        {

            nl = nd2.ChildNodes;

            Ask();

        }

    }

}

My question is how can I get the same result in my Windows Phone application?
I guess it would work with LINQ but I couldnt make it.
Please help!