Binding values in Dropdown in angular js

This is the code for binding the values into the drop down  using angular

HTML CODE:   
 <div class="form-group">

                            <label class="control-label col-md-4">State</label>
                            <div class="col-md-8">
                                <select class="form-control" ng-model="model.StateId" ng-options="item.StateId as item.StateName for item in states"> <option value="">--Select State--</option> </select>
                            </div>

                        </div>

Angular code:
 
$scope.states = [];

            $http({
                method: 'GET',
                url: 'GetStates',
            }).success(function (result) {
                $scope.states = result;
            });


.CS CODE

 public JsonResult GetStates()
        {
            ApplicationDbContext _db = new ApplicationDbContext();
            return Json(_db.States.Select(c => new { StateId = c.StateId, StateName = c.StateName }), JsonRequestBehavior.AllowGet);
        }