Longlist is not creating properly

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Visual-Studio

WCF

C#5.0

I want to populate longlist via WCF service. There are no errors in the code, just the result of the executed program looks like: "PhoneApp1.ServiceReference1.worker" instead of the name and other data I want to display. My service implementation is:

public IEnumerable<worker> GetStuffList()
        {
            List<worker> stuffList = new List<worker>();
            stuffList.Add(new worker("John", 23, true));
            stuffList.Add(new worker("Nick", 22, true));
            stuffList.Add(new worker("Gill", 23, false)); 
            return stuffList;
        }

        private List<Group<worker>> GetStuffEnumerable()
        {
            IEnumerable<worker> stuffList = GetStuffList();
            return GetItemGroups(stuffList, c => c.Age.ToString());
        }

        private static List<Group<T>> GetItemGroups<T>(IEnumerable<T> itemList, Func<T, string> getKeyFunc)
        {
            IEnumerable<Group<T>> groupList = from item in itemList
                                              group item by getKeyFunc(item) into g
                                              orderby g.Key
                                              select new Group<T>(g.Key, g);

            return groupList.ToList();
        }

        public class Group<T> : List<T>
        {
            public Group(string name, IEnumerable<T> items)
                : base(items)
            {
                this.Title = name;
            }

            public string Title
            {
                get;
                set;
            }
        }

My service interface is:

[ServiceContract]
    public interface IService1
    {
        [OperationContract]
       IEnumerable<worker> GetStuffList();
     
    }

   [DataContract]
    public class worker
    {
        public string Name;
        public int Age;
        public bool Sex;

        public worker(string Name, int Age, bool Sex)
        {
            this.Age = Age;

            this.Name = Name;
            this.Sex = Sex;
        }
    }

My WP page code is:

private void Button_Click(object sender, RoutedEventArgs e)
       {
           ServiceReference1.Service1Client proxy = new ServiceReference1.Service1Client();
           proxy.GetStuffListCompleted += showList;
           proxy.GetStuffListAsync();
       }
       private void showList(object sender, ServiceReference1.GetStuffListCompletedEventArgs e)
       {
           this.longlist.ItemsSource = e.Result;
       }

I think it has to be something with "this.longlist.ItemsSource = e.Result", but don't know how to correct it.