static void Pacman()
{
    Queue<MatchUpdateQueue> waiting = new Queue<MatchUpdateQueue>();

    events.WriteEntry("matchqueue worker thread started");

    while (!stop)
    {
        if (waiting.Count == 0)
        {
            /* grab any new items available */
            aDataContext db = new aDataContext();
            List<MatchUpdateQueue> freshitems = db.MatchUpdateQueues.OrderBy(item => item.id).ToList();

            foreach (MatchUpdateQueue item in freshitems)
                waiting.Enqueue(item);
            db.Dispose();
        }
        else
        {
            /* grab & dispatch waiting item */
            MatchUpdateQueue item = waiting.Peek();
            try
            {
                int result = ActionHandler.Handle(item);
                if (result == -1)
                    events.WriteEntry("unknown command consumed : " + item.actiontype.ToString(), EventLogEntryType.Error);

                /* remove item from queue */
                waiting.Dequeue();

                /* remove item from database */
                aDataContext db = new aDataContext();
                db.MatchUpdateQueues.DeleteOnSubmit(db.MatchUpdateQueues.Single(i => i == item));
                db.SubmitChanges();
                db.Dispose();
            }
            catch (Exception ex)
            {
                events.WriteEntry("exception while handling item : " + ex.Message, EventLogEntryType.Error);
                stop = true;
            }
        }

        /* to avoid hammering database when there's nothing to do */
        if (waiting.Count == 0)
            Thread.Sleep(TimeSpan.FromSeconds(10));
    }

    events.WriteEntry("matchqueue worker thread halted");
}

db.MatchUpdateQueues.DeleteOnSubmit(db.MatchUpdateQueues.Single(theItem => theItem == item));

Queue<MatchUpdateQueue> waiting = new Queue<MatchUpdateQueue>();
events.WriteEntry("matchqueue worker thread started");
while (!stop)
{
    using (var db = new aDataContext())
    {
      if (waiting.Count == 0)
      {
        /* grab any new items available */
           List<MatchUpdateQueue> freshitems = db.MatchUpdateQueues
                                                 .OrderBy(item => item.id)
                                                 .ToList();
           foreach (MatchUpdateQueue item in freshitems)
                waiting.Enqueue(item);
      }
      ...
   }
}

aDataContext db = new aDataContext();
item = new MatchUpdateQueue { id=item.id }; // <- updated
db.MatchUpdateQueues.Attach(item);
db.MatchUpdateQueues.DeleteOnSubmit(item);
db.SubmitChanges();

using (aDataContext db = new aDataContext())
{
   var dbItem = db.MatchUpdateQueues.Single(i => i.Id == item.Id);
   db.MatchUpdateQueues.DeleteOnSubmit(dbItem);
   db.SubmitChanges();
}

public void InitForm()
{
    'bnsEntity is a BindingSource and cachedAreas is a List<Area> created from dataContext.Areas.ToList()
    bnsEntity.DataSource = cachedAreas;
    'A nominal ID
    newID = cachedAreas.LastOrDefault().areaID + 1;
    'grdEntity is a GridView
    grdEntity.DataSource = bnsEntity;
}

private void tsbNew_Click(object sender, EventArgs e)
{
    var newArea = new Area();
    newArea.areaID = newID++;
    dataContext.GetTable<Area>().InsertOnSubmit(newArea);
    bnsEntity.Add(newArea);
    grdEntity.MoveToNewRecord();
}