<Window.Resources>

    <local:Person x:Key="mydatasource" Name="张三" ></local:Person>

</Window.Resources>

<Grid HorizontalAlignment="Left" Height="289" VerticalAlignment="Top" Width="533" DataContext="{StaticResource mydatasource}">

    <TextBox Name="textbox1" Text="{Binding Path=Name}" HorizontalAlignment="Left" Height="23" Margin="120,131,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120"/>

    <Button Content="Button" HorizontalAlignment="Left" Height="29" Margin="275,164,0,0" VerticalAlignment="Top" Width="76" Click="Button_Click"/>

    <TextBox Name="textbox2" HorizontalAlignment="Left" Height="23" Margin="120,192,0,0" TextWrapping="Wrap" Text="{Binding Path=Name}" VerticalAlignment="Top" Width="120"/>        

</Grid>

private void Button_Click(object sender, RoutedEventArgs e)

{

    textbox1.Text = "李四";

}

 class Person : INotifyPropertyChanged  

    {

        public event PropertyChangedEventHandler PropertyChanged; 



        private string name;

        public string Name

        {

            get { return name; }

            set

            {

                name = value;

                OnPropertyChanged("Name"); 

            }

        }

        protected void OnPropertyChanged(string name)

        {

            if (PropertyChanged != null)

            {

                PropertyChanged(this, new PropertyChangedEventArgs(name));