Не получается программно привязать Label к переменной

    public partial class WinShop : Window, INotifyPropertyChanged
    {
        private long total;
        public long Total
        {
            get { return total; }
            set { if (value != total) { total = value; RaisePropertyChanged("Total"); } }
        }
 
        public event PropertyChangedEventHandler PropertyChanged;
 
        public void RaisePropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
        public WinShop()
        {
            InitializeComponent();
 
            Binding binding = new Binding();
            binding.Source = Total;
            binding.Mode = BindingMode.OneWay;
            binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
            binding.Path = new PropertyPath("Total");
            lblTotalPrice.SetBinding(ContentProperty, binding);
        }
 
        private void btn1_Click(object sender, RoutedEventArgs e)
        {
            Total++;
        }
    }

            Binding binding = new Binding();
            binding.RelativeSource = new RelativeSource { Mode = RelativeSourceMode.FindAncestor, AncestorType=typeof(Window) };
            binding.Mode = BindingMode.OneWay;
            binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
            binding.Path = new PropertyPath("Total");
            lblTotalPrice.SetBinding(ContentProperty, binding);

            Binding binding = new Binding();
            binding.RelativeSource = new RelativeSource();
            binding.RelativeSource.AncestorType = typeof(Window);
            binding.Mode = BindingMode.OneWay;
            binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
            binding.Path = new PropertyPath("Total");
            lbl.SetBinding(ContentProperty, binding);