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Bind Slider value to TextBlock

<Window       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     x:Class="SDKSample.Pane1">     <StackPanel>       <TextBlock Margin="0,10,0,0"  Foreground="Blue">       <TextBlock Text="(Height,Width) = "/>       <TextBlock Text="{Binding ElementName=RectangleHeight,Path=Value}"/>       ,       <TextBlock Text="{Binding ElementName=RectangleWidth,Path=Value}"/>     </TextBlock>     <TextBlock Margin="10,10,0,0">Height</TextBlock>     <Slider Name="RectangleHeight"  Margin="10, 0, 0, 0"        Width="100" Orientation="Horizontal" HorizontalAlignment="Left"        Value="50" Minimum="0" Maximum="200"        SmallChange="1" LargeChange="10"       TickPlacement="BottomRight" TickFrequency="10"/>     <TextBlock Margin="10,0,0,0">Width</TextBlock>     <Slider Name="RectangleWidth" Margin="10, 0, 0, 0"        Width="100" Orientation="Horizontal" HorizontalAlignment="Left"        Value="50" Minimum="0" Maximum="200"       SmallChange="1" LargeChange="10"       TickPlacement="BottomRight" TickFrequency="10"/>         <Rectangle Fill="Blue" HorizontalAlignment="Left"                 Margin="50,20,0,0"                 Height="{Binding ElementName=RectangleHeight,Path=Value}"                 Width="{Binding ElementName=RectangleWidth,Path=Value}"/>     </StackPanel> </Window>