C# Google API - Load Contact's Groups ComboBox

When we insert a new contact, we need to indicate the group.
The following code shows how loading a combo box with the Contact's Groups

public void LoadGroupsComboBox()

        {

            ContactsService _service = new ContactsService("appName");

            _service.setUserCredentials("yourMail@gmail.com", "yourPassword");

            _service.QueryClientLoginToken();

            GroupsQuery query = new GroupsQuery(ContactsQuery.CreateGroupsUri("default"));

            GroupsFeed feed = _service.Query(query);

            while (feed != null && feed.Entries.Count > 0)

            {

                foreach (GroupEntry entry in feed.Entries)

                {

                    string gruppoNome = entry.Title.Text;

                    AtomId gruppoID = entry.Id;

                    ComboboxGroup item = new ComboboxGroup();

                    item.Text = gruppoNome;

                    item.Value = gruppoID;

                                   //add the item to your combo box

                    cbx_gruppi.Items.Add(item);

                }

                if (feed.NextChunk != null)

                {

                    query.Uri = new Uri(feed.NextChunk);

                    feed = _service.Query(query) as GroupsFeed;

                }

                else

                    feed = null;

            }

        }

---

Here the definition of the class ComboboxGroup used above.

class ComboboxGroup

    {

        public string Text { get; set; }

        public object Value { get; set; }

        public override string ToString()

        {

            return Text;

        }

    }

---

I want to remeber to go here http://support.google.com/mail/bin/answer.py?hl=it&answer=1173270 to get  Application-specific password

My Two Cents...