I need some help about Search Content Win 8 App

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C#

Windows

search

Win8

I add Search to Declarations. And I add search contract from new item. But I run the program, click search(on charms), insert some word and press enter. But the word which is I entered isn't come in to QueryText. How I Solve this? My project is nearly finish but I cant do this "search".

public sealed partial class SearchResultsMainPage : TurkiyeIftarVakitleri.Common.LayoutAwarePage
   {
       public SearchResultsMainPage()
       {
           this.InitializeComponent();
       }
       protected override void LoadState(Object navigationParameter, Dictionary<String, Object>    pageState)
       {
           var queryText = navigationParameter as String;
           var filterList = new List<Filter>();
           filterList.Add(new Filter("All", 0, true));
           this.DefaultViewModel["QueryText"] = '\u201c' + queryText + '\u201d';
           this.DefaultViewModel["Filters"] = filterList;
           this.DefaultViewModel["ShowFilters"] = filterList.Count > 1;
       }
       void Filter_SelectionChanged(object sender, SelectionChangedEventArgs e)
       {
           // Determine what filter was selected
           var selectedFilter = e.AddedItems.FirstOrDefault() as Filter;
           if (selectedFilter != null)
           {
               // Mirror the results into the corresponding Filter object to allow the
               // RadioButton representation used when not snapped to reflect the change
               selectedFilter.Active = true;

               // TODO: Respond to the change in active filter by setting this.DefaultViewModel["Results"]
               //       to a collection of items with bindable Image, Title, Subtitle, and Description properties

               // Ensure results are found
               object results;
               ICollection resultsCollection;
               if (this.DefaultViewModel.TryGetValue("Results", out results) &&
                   (resultsCollection = results as ICollection) != null &&
                   resultsCollection.Count != 0)
               {
                   VisualStateManager.GoToState(this, "ResultsFound", true);
                   return;
               }
           }

           // Display informational text when there are no search results.
           VisualStateManager.GoToState(this, "NoResultsFound", true);
       }
       void Filter_Checked(object sender, RoutedEventArgs e)
       {
           // Mirror the change into the CollectionViewSource used by the corresponding ComboBox
           // to ensure that the change is reflected when snapped
           if (filtersViewSource.View != null)
           {
               var filter = (sender as FrameworkElement).DataContext;
               filtersViewSource.View.MoveCurrentTo(filter);
           }
       }