wpf data binding

    public partial class Window2 : Window
    {   
        public Person vmPerosn = new Person();
        public Window2()
        {
            InitializeComponent();

            vmPerosn.Name = "Jack Zhao";
            vmPerosn.Phone = "13666666666";
            vmPerosn.idNo = "110110110110110110";
            //tb1.DataContext = vmPerosn;
            this.DataContext = vmPerosn;
            //< TextBox Name = "tb1" Grid.Column = "3"  Text = "{Binding Path=Name}"  TextWrapping = "Wrap" VerticalContentAlignment = "Center" HorizontalContentAlignment = "Stretch" />

            Binding myBinding = new Binding();
            myBinding.Source = vmPerosn;
            myBinding.Path = new PropertyPath("Phone");
            myBinding.Mode = BindingMode.TwoWay;
            myBinding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
            BindingOperations.SetBinding(tb2, TextBox.TextProperty, myBinding);
        }
    }