<Window x:Class="BindingTest.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:src="clr-namespace:BindingTest"
  Title="Simple Data Binding Sample">
    <Window.Resources>
        <src:Person x:Key="myDataSource" PersonName=""/>
    </Window.Resources>
</Window>

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 BindingTest
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
    }

    public class Person : INotifyPropertyChanged
    {
        String internal_PersonName;

        public Person()
        {
        }
        
        public String PersonName
        {
            get
            {
                return internal_PersonName;
            }
            set
            {
                PersonName = value;
                
                if (PropertyChanged != null)                
                    PropertyChanged(this, new PropertyChangedEventArgs("PersonName"));
            }
        }

        #region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;

        #endregion
    }
}