WPF

[OperationContract]
public bool GetList(out ObservableCollection<string> list)
{
    list = new ObservableCollection<string>();
    string folder = ???;
    string[] files = Directory.GetFiles(folder, "*.jpg");
    foreach (string path in files)
    {
        string fileOnly = System.IO.Path.GetFileName(path);
        list.Add(fileOnly);
    }
    return true;
}

ObservableCollection<string> GetFileNamesFromFtpDirectory(string remotePath)
{
    var result = new ObservableCollection<string>();
    Uri uri = new Uri(remotePath);
    WebRequest ftp = FtpWebRequest.Create(uri) as FtpWebRequest;
    ftp.Credentials = new NetworkCredential("xxxx", "yyyy");
    ftp.Method = WebRequestMethods.Ftp.ListDirectory;
    WebResponse response = null;
    try
    {
        response = ftp.GetResponse();
    }
    catch (Exception e)
    {
        // "The remote server returned an error: (530) Not logged in."
        string error = e.Message;
        return null;
    }
    using (StreamReader reader = new StreamReader(response.GetResponseStream()))
    {
        string line = reader.ReadLine();
        while (line != null)
        {
            result.Add(line);
            line = reader.ReadLine();
        }
    }
    return result;
}

"ftp://www.website.com/ClientBin/SplashScreenPhotos"

 __________________________________________________________________________
|          |           |       |           |         |           |        |
|ComboBox  | Seperator | Label | Seperator | TextBox | Seperator | Slider |
|__________|___________|_______|___________|_________|___________|________|

private void listBox1_LayoutUpdated(object sender, EventArgs e)
{
  if (sender != null)
  {
     ListBoxItem l = new ListBoxItem();
     l.Content = "S";
     ListBoxItem n = new ListBoxItem();
     n.Content = "A";
     ((ListBox)sender).Items.Add(l);
     this.lstItems.Items.Add(n);
     MessageBox.Show(((ListBox)sender).Name);
     MessageBox.Show(Convert.ToString(((ListBox)sender).Items.Count));
  }
}