WPF Breadcrumb Folder TextBox

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Drawing;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Data;
using System.Windows.Interop;
using System.Windows;
using System.Runtime.InteropServices;
using vbAccelerator.Components.ImageList;
using System.Diagnostics;
using System.Threading;
using System.Windows.Threading;

namespace QuickZip.UserControls.Breadcrumb.Tools
{

    [ValueConversion(typeof(string), typeof(ImageSource))]
    public class AnimalToIconConverter : IValueConverter
    {

        #region IValueConverter Members

        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            string s = (value as string);
            if (s == "" || s == "AnimalRoot" )
                return "/Breadcrumb/Resources/AnimalIcon/animal.jpg";
            string animal = s.Substring(s.Length-4,3).ToLower();
            return "/Breadcrumb/Resources/AnimalIcon/" + animal + ".jpg";

        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException();
        }

        #endregion
    }
}