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Hello guys.
I have try show data and get value using autocomplete jquery. Textbox will show data choose and label will get value .But it's error

1.  Uncaught TypeError: Cannot read property 'DEPARTMENT_ID' of undefined .

 This is data JSON when i see console.log

1. Object {d: "[{"DEPARTMENT_ID":"D00000000001","DEPARTMENT_NAME"…"2015-05-05T00:00:00","EDIT_BY":"","FLAG":false}]"}
2. d: "[{"DEPARTMENT_ID":"D00000000001","DEPARTMENT_NAME":"HR","DEPARTMENT_DES":"HR","EDIT_DATE":"2015-05-05T00:00:00","EDIT_BY":"","FLAG":false},
3. {"DEPARTMENT_ID":"D00000000002","DEPARTMENT_NAME":"ACCOUNT","DEPARTMENT_DES":"ACCOUNT","EDIT_DATE":"2015-05-05T00:00:00","EDIT_BY":"","FLAG":false}]"
4. __proto__: Object

and this is function

1. function load_text() {
               $.ajax(
               {
                   type: "POST",
                   url: "../BUS/WebService.asmx/LIST_DEPARTMENT",
                   contentType: "application/json; charset=utf-8",
                   dataType: "json",
                   success: function (data) {
                       var valuetextbox = [];
                       $.each($.parseJSON(data.d), function (idx, obj) {
                           valuetextbox.push(obj.DEPARTMENT_NAME);
                       });
                       $('#txt_textbox').autocomplete({
                           source: valuetextbox,
                           select: function (event, ui) {
                               $("#label_value").val(ui.item.obj.DEPARTMENT_ID);
                           }
                       });
                   },
                   error: function (data) {
                       alert("Error load");
                   }
               });
           }