How to get the full path of selected TreeViewItemAdv of the TreeViewAdv?

  <syncfusion:TreeViewAdv Name="treeViewAdv" >
            <syncfusion:TreeViewItemAdv Name="treeViewItemAdv" Header="Marital Status">
                <syncfusion:TreeViewItemAdv Header="Single">
                    <syncfusion:TreeViewItemAdv Header="Student"/>
                    <syncfusion:TreeViewItemAdv Header="Exployee"/>
                    <syncfusion:TreeViewItemAdv Header="Businessman"/>
                </syncfusion:TreeViewItemAdv>
                <syncfusion:TreeViewItemAdv Header="Married"/>
                <syncfusion:TreeViewItemAdv Header="Married with Children"/>
            </syncfusion:TreeViewItemAdv>
            <syncfusion:TreeViewItemAdv Header="Baby Vaccines">
                <syncfusion:TreeViewItemAdv Header="Hepatitis B"/>
                <syncfusion:TreeViewItemAdv Header="Tetanus"/>
                <syncfusion:TreeViewItemAdv Header="Polio"/>
                <syncfusion:TreeViewItemAdv Header="Measles"/>
            </syncfusion:TreeViewItemAdv>
            <syncfusion:TreeViewItemAdv Header="Country Information">
                <syncfusion:TreeViewItemAdv Header="Canada"/>
                <syncfusion:TreeViewItemAdv Header="France"/>
                <syncfusion:TreeViewItemAdv Header="Germany"/>
                <syncfusion:TreeViewItemAdv Header="UK"/>
                <syncfusion:TreeViewItemAdv Header="USA"/>
            </syncfusion:TreeViewItemAdv>
   </syncfusion:TreeViewAdv>

        public MainWindow()
        {
            InitializeComponent();
            treeViewAdv.SelectedItemChanged += TreeViewAdv_SelectedItemChanged;
        }
 
        /// <summary>
        /// Invoked when the SelectedItem changed
        /// </summary>
        private void TreeViewAdv_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
        {
            MessageBox.Show("Selected Item Path: " + GetFullPath((treeViewAdv.SelectedTreeItem as TreeViewItemAdv)));
        }
 
        /// <summary>
        /// To get the full path of the TreeViewItemAdv
        /// </summary>
        public string GetFullPath(TreeViewItemAdv node)
        {
            if (node == null)
                throw new ArgumentNullException();
 
            var result = Convert.ToString(node.Header);
 
            for (var i = GetParentItem(node); i != null; i = GetParentItem(i))
                result = i.Header + "\\" + result;
 
            return result;
        }
 
        /// <summary>
        /// To get the parent of the item
        /// </summary>
        static TreeViewItemAdv GetParentItem(TreeViewItemAdv item)
        {
            for (var i = VisualTreeHelper.GetParent(item); i != null; i = VisualTreeHelper.GetParent(i))
                if (i is TreeViewItemAdv)
                    return (TreeViewItemAdv)i;
 
            return null;
        }