I want to notify Xaml of property changes in OnPropertyChanged

public partial class MainWindow:Window,INotifyPropertyChanged
{
    public MainWindow()
    {
        InitializeComponent();
        GenerateBlock();
    }

    internal enum PropertyNames
    {
        BlockColumnPosition 1,
        BlockRowPosition 1,
    }


    /// <summary>
    /// Block Location (Column)
    /// </summary>
    private Int32 blockColumnPosition;

    /// <summary>
    /// Block position (row)
    /// </summary>
    private Int32 blockRowPosition;


    /// <summary>
    /// Gets and sets the block position (column).
    /// </summary>
    private Int32 BlockColumnPosition1
    {
        get
        {
            return this.blockColumnPosition;
        }
        set
        {
            This.blockColumnPosition=value;
            This.OnPropertyChanged(PropertyNames.BlockColumnPosition1.ToString());
        }
    }

    /// <summary>
    /// Gets and sets the block position (row).
    /// </summary>
    private Int32 BlockRowPosition1
    {
        get
        {
            return this.blockRowPosition;
        }
        set
        {
            This.blockRowPosition=value;
            This.OnPropertyChanged(PropertyNames.BlockRowPosition1.ToString());
        }
    }


    private void GenerateBlock()
    {
        BlockColumnPosition 1 = 5;
        BlockRowPosition 1 = 1;
    }

    public event PropertyChangedEventHandler PropertyChanged;
    protected void OnPropertyChanged (String propertyName)
    {
        if (PropertyChanged!=null)
            PropertyChanged (this, new PropertyChangedEventArgs (propertyName));
    }


}