WPF

namespace BindingTest
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public class BindingClass
    {
        public int iEllipseLeft { get; set; }
        public BindingClass()
        {
            iEllipseLeft = 30;
        }
    }

    public partial class Window1 : Window
    {

        //Declare at top, so we could use it from anywhere       
        BindingClass bClass;
            
        public Window1()
        {
            InitializeComponent();
            bClass = new BindingClass();
        }

        // Update property of class
        private void updateLoc()
        {
            Random random = new Random();
            bClass.iEllipseLeft = random.Next(0, 100);
        }
    }
}

<Canvas Margin="16,128,244,52" Background="#FFE8E8E8">
	<Ellipse Fill="#FFFE0C0C" Width="32" Height="32" Canvas.Left= "5" Canvas.Top="48"/>
</Canvas>

class MyObject {
    public string Value { get; set; }
}

<Button Content="{my:CustomBinding Value}">

public MainWindow()
{
	InitializeComponent();
	this.DataContext = MyObject;
}

<Rectangle Fill="{TemplateBinding Foreground}"
Height="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Width}"
Width="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Value}"
Margin="0,0" ></Rectangle>