windows store application page refresh

Question

I am new to windows store application development and currently i am developing a news application and i want to refresh the page to get news updated. i stated developing the default layout which is given to us when starting a project and i am lost with the page dictionary because once the page is created. It gets save so is there a way to refresh a page!!! LoadState method is called when application runs for the first time when refresh is clicked the view get clear but all the data is saved in the dictionary according to my knowledge is there a easy way to clear data inside the groups and recall the methods so that the new data will get filled in.can some one please guide me with the relevant steps

  protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
    {
       var sampleDataGroups = SampleDataSource.GetGroups((String)navigationParameter);
       this.DefaultViewModel["Groups"] = sampleDataGroups;
    }

   private void refresh(object sender, RoutedEventArgs e)
    {
        this.DefaultViewModel.Clear();

    }

Answer 1

How about:

private string parameter;

protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
{
   parameter = (string)navigationParameter;
   reloadData();
}

private void reloadData() 
{
   var sampleDataGroups = SampleDataSource.GetGroups(parameter);
   this.DefaultViewModel["Groups"] = sampleDataGroups;
}

private void refresh(object sender, RoutedEventArgs e)
{
   reloadData() 
}