Hi

You can use the jQuery plugin: TreeView to achieve it.

http://bassistance.de/jquery-plugins/jquery-plugin-treeview/

Add this script in your View:

<script type="text/javascript">
    $(document).ready(function () {
        $('#jQuerytreeview').treeview({ collapsed: true });

        $(".city").click(function () {
            $.ajax({
                url: '@Url.Action( MVC.Various.TreeView.GetCity( ) )',
                data: { cityId: $(this).attr("id") },
                type: 'GET',
                success: function (data) {
                    alert("Selected city: " + data.Name + ");
                }
            });
        });
    });
</script>

Hope this helpful
Regards
Young Yang