Populating A DropDown and selection a value from the list

$.post("getAllState", {}, function (response) {//2

                    if (response.State != null) {//3

                    var state=response.State;

                     var id=2;

                    $('#ddlState').find("option").remove();

                    $('#ddlState').append($("<option>Select</option>"));

                        $.each(state, function () {//4

                            $('#ddlState').append($("<option/>").val(this.stateId).text(this.stateName));

                        });//4

                       // $('#ddlState option:contains(' + college.stateName + ')').attr('selected', 'selected');

                        $("#ddlState option[value=" + Id +"]").attr('selected', 'selected');

                    }//3

                }); //2