DataBinding with procedural Code

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;
 
namespace WPF_Testground
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        BindingSource bindingSource = new BindingSource();
        public Window1()
        {
            InitializeComponent();
            createTextBlock();                      
        }           
 
        public void createTextBlock()
        {
 
            BindingSource bindingSource2 = new BindingSource();
 
            TextBlock tb = new TextBlock();
            tb.Text = "Eine Box";
            Binding binding = new Binding();
            binding.Source = bindingSource;
            binding.Path = new PropertyPath("Wert");
            tb.SetBinding(TextBlock.TextProperty, binding);
            grid.Children.Add(tb);           
        }
 
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            bindingSource.Wert++;
        }
 
    }
 
    class BindingSource : System.Windows.DependencyObject
    {
        public static System.Windows.DependencyProperty WertProperty;
 
        public BindingSource()
        {
            if (BindingSource.WertProperty == null)
            {
                BindingSource.WertProperty = System.Windows.DependencyProperty.Register("Wert", typeof(int), typeof(BindingSource));
            }
            SetValue(BindingSource.WertProperty, 0);
        }
 
        public int Wert
        {
            get { return Int32.Parse(GetValue(BindingSource.WertProperty).ToString()); }
            set { SetValue(BindingSource.WertProperty, value); }
        }
    }
}