create dynamic menu item and submenus item

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ASP.NET

MVC3

hi my project is

i have to create id, parent id , Name in database

this is my database

id    Parentid   Name
---------------------
1       0         A
2       1         B
3       1         C
4       0         D
5       4         E
6       4         F
7       0         G

now i should get output as

A    D     G
------------
B    E
C    F

if i add any more main menus are sub menus automatically it should take.

i have used json my code is

this is my view page
---------------------

script type="text/javascript">
    var url = '/home/get'
    $.ajax({ type: "get",
        url: url,
        datatype: "json",
        error: function (xhr, status, error) {
            alert(error);
        },
        success: function (json) {
            var g = json.st.length;
           // var h = json.r.length;
            alert("displaying values: " + g);
            var menu = new dhtmlXMenuObject("menuObj");
          //  menu.attachEvent("onTouch", menuTouch);
            {
                for (i = ((json.st.length) - 1); i >= 0; i--) {
                    alert("displayed data: " + json.st);
                    menu.addNewSibling(null, "a", json.st[i], false);
                    {
                        // if (json.st.id == json.st.Parentid)
                        if(json.r[i].id == json.r[i].Parentid)
                           // for (i = ((json.r.length) - 1); i >= 0; i++)
                            {
                                menu.addNewChild("a", 0, "new", json.r[i], false);
                            }
                            else
                            {
                                // menu.addNewSeparator("new");
                                menu.addNewChild("b", 0, "file", json.r[i], false);
                            }
                         alert("displaying data: " + json.r);
                    }
                }
        }
    });
</script>
</head>

but im getting out put

A    D     G
------------
B    
C    

i am not getting the secong main menu item

i couldn't able to get submenus from main menu D G etccc


so plaese suggest if there is any step to proceed

Thank you