why main thread is still working in threadpool

Question

I wrote a code that i wan to call worker thread to get some info from wcf service , but when i debugg it, i find out that main thread is still running

 ThreadPool.QueueUserWorkItem(o =>
                {
                    ServiceConnection sc = new ServiceConnection();
                       Deployment.Current.Dispatcher.BeginInvoke(()=>
                           {
                              rowDetail rwdetail = new rowDetail(sc.getHistoryInformation(((Historyreport)e.AddedItems[0]).rowCode));
                              rwdetail.Show();
                           }
                );});
       

Answer 1

Deployment.Current.Dispatcher's thread *IS* the UI thread.  So basically you're starting a thread that executes something asynchronously on the main thread.