filling a jQuery autocompleate list with webservice data?

Question

This is my Webservice responsible to fill the autocompleate:

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
[System.Web.Script.Services.ScriptService]
public class WebService : System.Web.Services.WebService {

[WebMethod]
public List<Farms> GetFarms1()
{
    PlaseTableAdapter pta = new PlaseTableAdapter();
    PlaseLande.PlaseDataTable pdt = pta.GetData();

    List<Farms> farms = new List<Farms>();
    foreach (DataRow dr in pdt)
    {
        string farmName = (string)dr["FARMNAME"];
        string farmID = (string)dr["FARMID"];
        farms.Add(new Farms(farmID, farmName));
    }
    return farms;
}


 public class Farms
    {
        public Farms(string farmid, string farmname)
        {
            FARMID = farmid;
            FARMNAME = farmname;
        }

        public string FARMID { get; set; }
        public string FARMNAME { get; set; }
    }

}

This is the jquery to get the json data from the webservice

$("#txtFarms").autocomplete("WebService.asmx/GetFarms1", {
                        dataType: 'json',
                            parse: function(data) {
                                var parsed = [];
                                data = data.Farms;

                                for (var i = 0; i < data.length; i++) {
                                    parsed[parsed.length] = {
                                        data: data[i],
                                        value: data[i].FARMNAME,
                                        result: data[i].FARMNAME
                                    };
                                }

                                return parsed;
                            },
                            formatItem: function(item) {
                                alert(item);
                                return item.FARMNAME + ' (' + item.FARMID + ')';
                            }
                        });

My code isn't workin what am i missing? Tanks for any assistance!