WPF AutoComplete Folder TextBox

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 System.ComponentModel;

namespace AutoCompleteTextBox
{

    public class Model : INotifyPropertyChanged
    {
        string _text;
        public string Text { get { return _text; } set { _text = value; OnPropertyChanged("Text"); } }

        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(
                    this,
                    new PropertyChangedEventArgs(propertyName)
                    );
            }
        }
    }

    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        

        public Window1()
        {
            InitializeComponent();
            DataContext = new Model();
        }
    }
}