WPF twoway binding

Question

Hi all,

 

Please can anyone say what is the mistake here?? 

 

<Window x:Class="WpfApplication1.MainWindow"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="MainWindow" Height="350" Width="525">

<Grid>

<Slider x:Name="MySlider" HorizontalAlignment="Left" Margin="113,70,0,0" VerticalAlignment="Top" Width="322"/>

<Rectangle Height="(Binding Mode=TwoWay, Element Name:MySlider, Path=Value, Update Source Trigger=propertyChanged)" Fill="#FFF4F4F5" HorizontalAlignment="Left" Margin="113,150,0,0" Stroke="Black" VerticalAlignment="Top" Width="100"/>

</Grid>

</Window>