public ActionResult Monitoring()
        {
            //get list to pass to data in view
             IList<TreeListModel> monitoringTree = new List<TreeListModel>();
            using (RBACEntities db = new IOT_Street.Models.RBACEntities())
            {
                string[] cityLst = { "Tangerang", "Cirebon", "Kuningan", "Indramayu", "Tegal", "Padang" };
                // var topModel = new TreeListModel();
                //topModel.Name = "Cities";
                foreach (var city in cityLst)
                {
                    var cityModel = new TreeListModel();
                    var cityRecords = db.IndonesianPostcodes.Where(s => s.CITY == city).ToList<IndonesianPostcode>();
                    cityModel.Name = city;
                    var districts = cityRecords.ToList<IndonesianPostcode>().GroupBy(f => f.DISTRICT);
                    foreach (var distt in districts)
                    {
                        var D = distt.FirstOrDefault();
                        var districtModel = new TreeListModel()
                        {
                           Id = D.Id
                        };
                        districtModel.Name = distt.Key;
                        var villages = distt.ToList<IndonesianPostcode>().GroupBy(f => f.Village);
                        foreach (var village in villages)
                        {
                            var V = village.FirstOrDefault();
                            var villageModel = new TreeListModel()
                            {
                               Id = V.Id
                            };
                            villageModel.Name = village.Key;
                            var RoadNames = village.ToList<IndonesianPostcode>().GroupBy(f => f.RoadName);
                            foreach (var road in RoadNames)
                            {
                                var R = road.FirstOrDefault();
                                var roadnameModel = new TreeListModel()
                                {
                                   // Id = R.Id
                                };
                                roadnameModel.Name = road.Key;
                                var EMI = road.ToList<IndonesianPostcode>().GroupBy(f => f.EnergymeterID);
                                foreach (var emi in EMI)
                                {
                                    var E = emi.FirstOrDefault();
                                    var energyMeterModel = new TreeListModel()
                                    {
                                        Id = E.Id,
                                        Name = E.EnergymeterID,
                                        //Latitude = E.Latitude,
                                        //Longitude = E.Longitude

                                    };
                                    roadnameModel.List.Add(energyMeterModel);
                                }
                                villageModel.List.Add(roadnameModel);
                            }
                            districtModel.List.Add(villageModel);
                        }
                        cityModel.List.Add(districtModel);
                    }
                    monitoringTree.Add(cityModel);
                }

            }
            //var jsonResult = Json(chapters, JsonRequestBehavior.AllowGet);
            //jsonResult.MaxJsonLength = int.MaxValue;
            //return jsonResult;
            return View(monitoringTree);

        }`

@helper TreeView(IEnumerable<IOT_Street.Models.TreeListModel> items)
    {
foreach (var item in items)
{

            <li>

                @if (item.IsChild)
                {
                    <a class="leaf @item.Type" id="@item.Id" name="@item.Name" style="color: #e1e1e2;">@item.Name</a>
                }
                else
                {
                    <a class="leaf @item.Type" id="@item.Id" name="@item.Name" style="color: #e1e1e2;">@item.Name</a>
                    <a href="@Url.Action("Add", "Tree", new { id = item.Id })" class="AddGPS" id="@item.Id" lat="@item.Latitude" Lng="@item.Longitude">
                        <img src="~/images/Plus_sign.png" width="10px" height="10px" id="btnshow" class="a_@item.Id" />
                    </a>

                    <ul style="background-color:#2a3f54;">
                        @TreeView(item.List)
                    </ul>
                }
            </li>

   }
                 }

            <nav class="main-nav">
                <ul id="chapterFolders" class="filetree " style="font-family:Arial; font-size: 15px;">
                    @TreeView(Model)
                </ul>
            </nav>