How I get data alphabatically from xml file in Listbox

private void btnGetNameAndSort_Click(object sender, EventArgs e)

        {

            XmlDocument doc = new XmlDocument();

            doc.Load("test.xml");

            List<string> list = new List<string>();

            foreach (XmlNode node in doc.ChildNodes)

            {

                if (node.Name == "phonebooklist")

                {

                    foreach (XmlNode x in node.ChildNodes)

                    {

                        if (x.Name == "pbdata")

                        {

                            foreach (XmlNode y in x.ChildNodes)

                            {

                                if (y.Name == "name")

                                {

                                    list.Add(y.InnerText);

                                }

                            }

                        }

                    }

                }

            }

            list.Sort();

            listBox1.DataSource = list;

        }