C# 以编程方式绑定不会'；在运行时添加控件时无法工作

我有两个文本框，我想在运行时绑定它们的可见性属性

当我通过Xaml添加文本框时，绑定会起作用，但当我以编程方式添加文本框时，绑定不会起作用

任何帮助

    public partial class Window1 : Window
    {
        TextBox txt1 = new TextBox();
        TextBox txt2 = new TextBox();
        public Window1()
        {
            InitializeComponent();

            txt1.Name = "txt1";
            txt1.Margin= new Thickness(30,0,128,0);
            txt1.VerticalAlignment = VerticalAlignment.Top;

            txt2.Name = "txt2";
            txt2.Margin = new Thickness(30, 32, 128, 0);
            txt2.VerticalAlignment = VerticalAlignment.Top;

            Binding binding = new Binding();
            binding.ElementName = "txt1";
            binding.Path = new PropertyPath(TextBox.VisibilityProperty);
            BindingOperations.SetBinding(txt2, TextBox.VisibilityProperty, binding);


            grid.Children.Add(txt1);
            grid.Children.Add(txt2);
        }
    }

---

提前感谢

更新

不要设置

ElementName

属性，只需将

Binding

的

Source

属性设置为要绑定到的元素对象即可

TextBox txt1 = new TextBox();
TextBox txt2 = new TextBox();

public Window1()
{
   InitializeComponent();

   txt1.Name = "txt1";
   txt1.Margin = new Thickness(30, 0, 128, 0);
   txt1.VerticalAlignment = VerticalAlignment.Top;
   txt1.Visibility = Visibility.Visible;

   txt2.Name = "txt2";
   txt2.Margin = new Thickness(30, 32, 128, 0);
   txt2.VerticalAlignment = VerticalAlignment.Top;

   Binding binding = new Binding();
   binding.Source = txt1; // set the source object instead of ElementName
   binding.Path = new PropertyPath(TextBox.VisibilityProperty);
   BindingOperations.SetBinding(txt2, TextBox.VisibilityProperty, binding);

   grid.Children.Add(txt1);
   grid.Children.Add(txt2);
}