Dynamic Menu Bar with Chiled Relation In MVC Ajax Call : Hi i am student working on a Project in MVC i am Creating Dynamic Menu bar i retrieve Main Menu successfully Now stuck how to get thier Child Menu here is my code and table

     ---------------------------
     ID     ParentID    MenuName
     ---------------------------
      1       NULL       Home
      2       Null       Contact Us
      3         2        Address
      4         2        Place

     //html
     <div id="menu">
        <ul>            
        </ul>
     </div>

     //jquery code
    function LoadMenubarSuccess(response) {
        if (response != undefined && response != null && response.length > 0) {
            var IncidentData = "<ul>";
            $.each(response, function (index, Obj) {
                if (Obj.ParentMenuID == null || Obj.ParentMenuID == 0) {
                    IncidentData += "<li>"
                   + "<a href='" + Obj.Url + "'>" + Obj.MenuName + "</a>"
                   + "</li>"
                }
                if (Obj.ParentMenuID == !null || Obj.ParentMenuID > 0) {  
                      //Chiled Menu???            
                }
            });
            IncidentData +="</ul>";
            $("#menu").html(IncidentData.replace(/null/g, ' - '));
        }
    }