how to select xml attribute value and then select its chilb element

<items>
<

i want to bind the item 2 name in list box

my c#
<pre lang="c#">
private void cmbecg_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (cmbecg.SelectedIndex == 1)
            {
                XmlDocument xdoc = new XmlDocument();
                xdoc.Load(@"F:\tuner4tronics\t4tdevicedescriptor\t4tdevicedescriptor\ecgdiscription.xml");
                XmlNodeList ecglistfeatures = xdoc.SelectNodes("items/item/features/name");
                if (lst1.Items.Count == 0)
                {
                    foreach (XmlNode name in ecglistfeatures)
                    {
                            lst1.Items.Add(name.InnerText.Trim());
                    }
                }
            }
            else if (cmbecg.SelectedIndex == 2) !!!!!!here i want to bind item 2 name !!!!!!!
            {
                lst1.Items.Clear();
                XmlDocument xdoc = new XmlDocument();
                xdoc.Load(@"F:\tuner4tronics\t4tdevicedescriptor\t4tdevicedescriptor\ecgdiscription.xml");
                XmlNodeList ecglistfeatures = xdoc.SelectNodes("items/item/attribute[id='2']/name");
                if (lst1.Items.Count == 0)
                {
                    foreach (XmlNode name in ecglistfeatures)
                    {
                        lst1.Items.Add(name.InnerText.Trim());
                    }
                }
            }
           
        }