TickerManagement [C#]

 using System; 
 using System.Collections.Generic; 
 using System.Linq; 
 using System.Text; 
 using System.Windows; 
 using System.Windows.Controls; 
 using System.Windows.Data; 
 using System.Windows.Documents; 
 using System.Windows.Input; 
 using System.Windows.Media; 
 using System.Windows.Media.Imaging; 
 using System.Windows.Navigation; 
 using System.Windows.Shapes; 
 using WpfApplication1.ServiceReference1; 
 using System.Collections.ObjectModel; 
 using System.Globalization; 
  
 namespace WpfApplication1 
 { 
      
     // Interaction logic for TickerManagement.xaml 
     public partial class TickerManagement : UserControl 
     { 
         ServiceSample sample = new ServiceSample(); 
  
         public TickerManagement() 
         { 
             InitializeComponent(); 
         } 
  
         //Initialize the XAML object and retrieve group from server by login 
         public TickerManagement(string login, string password) 
         { 
             InitializeComponent(); 
  
             //Login and retrive group 
             List<View_Group> listResult; 
             sample.GetGroup(out listResult, login, password); 
  
             //Bind group to TreeList 
             treeGroup.ItemsSource = TreeNode.GetTreeNode(listResult); 
         } 
  
         //Select group and retrive coresponding ticker 
         private void treeGroup_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e) 
         { 
             //Retrive tickers from selected group 
             List<View_Banner> listResult; 
             sample.GetTicker(out listResult, (treeGroup.SelectedItem as TreeNode).Id ?? 0); 
  
             //Bind ticker to List 
             gridTicker.ItemsSource = new ObservableCollection<View_Banner>(listResult); 
         } 
  
         //Select ticker and display this status 
         private void gridTicker_SelectionChanged(object sender, SelectionChangedEventArgs e) 
         { 
             if (gridTicker.SelectedItem == null) return; 
  
             //Display if the ticker as 'Published' or 'Unpublished' 
             btnPublish.Content = (gridTicker.SelectedItem as View_Banner).FolderId == -1 ? "Unpublished" : "Published"; 
         } 
  
         //Published / Unpublished a tcker 
         private void btnPublish_Click(object sender, RoutedEventArgs e) 
         { 
             //Keep the ticker to publish 
             View_Banner ticker = gridTicker.SelectedItem as View_Banner; 
  
             //Change this folder id 
             ticker.FolderId = ticker.FolderId == -1 ? -2 : -1; 
  
             //Update the ticker 
             sample.UpdateTicker(ref ticker); 
  
             //Refresh the ticker collection 
             gridTicker_SelectionChanged(null, null); 
         } 
     } 
  
     public class PublishConvert : IValueConverter 
     { 
         public object Convert(object value, Type targetType, object parameter, CultureInfo culture) 
         { 
             return System.Convert.ToInt32(value) == -1 ? "Published" : "Not Published"; 
         } 
  
         public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) 
         { 
             throw new NotImplementedException(); 
         } 
     } 
 }