Signum.Windows.AutocompleteTextBox.delayTimer_Tick C# (CSharp) Метод

        internal void delayTimer_Tick(object sender, EventArgs e)
        {
            delayTimer.Stop();

            if (Autocompleting == null) 
                throw new NullReferenceException("SeachMethod cannot be null.");

            string text = txtBox.Text;

            source = new CancellationTokenSource();
            var context = Statics.ExportThreadContext();
            var task = Task.Factory.StartNew<IEnumerable>(() =>
            {
                Statics.ImportThreadContext(context);
                return Autocompleting(text, source.Token);
            }, source.Token);

            task.ContinueWith(res =>
            {
                if (res.IsFaulted)
                    Async.OnAsyncUnhandledException(res.Exception.InnerExceptions.FirstEx(), Window.GetWindow(this));
                else
                {
                    lstBox.ItemsSource = res.Result;
                    
                    if (lstBox.Items.Count > 0)
                    {
                        lstBox.SelectedIndex = -1;
                        pop.Width = lstBox.Width;
                        pop.Height = lstBox.Height;
                        pop.IsOpen = true;
                    }
                    else
                    {
                        pop.IsOpen = false;
                    }
                }
            }, source.Token, TaskContinuationOptions.NotOnCanceled, TaskScheduler.FromCurrentSynchronizationContext()); 
        }

        public void SetValue(string value)
        {
            AutocompleteTextBox ac = ((AutocompleteTextBox)base.Owner);

            ac.Text = value;
            ac.delayTimer_Tick(null, null);
            if (ac.AllowFreeText && ac.lstBox.Items.Count == 0)
            {
                ac.Close(CloseReason.LostFocus);
            }
        }