Auto Complete textbox

------------------------ASPX PAGE--------------------------------
var AutoTestID = 0;
$(document).ready(function(){


        $("#txtTestName").autocomplete({
                source: function (request, response) {
                    TestID= 0;
                    $.ajax({
                        url: "ReferalIntakeOrg.aspx/GetPatientNameAutoSugg",
                        data: "{ 'TestName': '" + request.term + "','PhoneNo':'"+ $("#txtPrimaryNo").val()+"'}",
                        dataType: "json",
                        type: "POST",
                        contentType: "application/json; charset=utf-8",
                        dataFilter: function (data) { return data; },
                        success: function (data) {
                            response($.map(data.d, function (item) {
                                return {
                                    label: item.Name,
                                    value: item.Name,
                                    Id: item.Id
                                }
                            }))
                        }
                    });
                },
                minLength: 1,
                select: function (event, ui) {
                    AutoTestID= ui.item.Id;
                    FillTestDetails(AutoTestID);
                }
            });
}); //document.ready ends here




--------------ASPX.CS PAGE----------------
[WebMethod]
        public static List<AutoFillItem> GetPatientNameAutoSugg(string PatientName, string PrimaryContactNo)
        {
            List<AutoFillItem> list = new List<AutoFillItem>();
            ServiceReference1.TestWCFServiceClient oITestWCFService = new ServiceReference1.TestWCFServiceClient();
            DataSet ds = oITestWCFService.GetTestNameAutoSugg(TestName, PhoneNo);

            foreach (DataRow tr in ds.Tables[0].Rows)
            {
                AutoFillItem item = new AutoFillItem();
                item.Id = tr[0].ToString();
                item.Name = tr[1].ToString();

                list.Add(item);
            }
            return list.ToList();
        }

------------------------ADD A CLASS AutoFillItem.cs------------------
//declare our needs
 public string Id;
 public string Name;