Binding TextBlock to TextBox

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I am new to the C# and trying the elements bindings. I created a slider bar and textbox to control the fontsize of textblock. The following snippet is not working,

C#

<TextBlock Name="lblText" Height="23" HorizontalAlignment="Left" Margin="20,20,0,0" Text="TextBlock" VerticalAlignment="Top" />
<Slider Name="sldValue" Value="{Binding ElementName=txbValue, Path=Text, Mode=TwoWay}"  Height="23" HorizontalAlignment="Left" Margin="20,60,0,0"  VerticalAlignment="Top" Width="200" Minimum="1" Maximum="40"/>
<TextBox Name="txbValue" Text="{Binding ElementName=lblText, Path=FontSize, Mode=TwoWay}" Height="23" HorizontalAlignment="Left" Margin="20,100,0,0" VerticalAlignment="Top" Width="120" />

However, if I move the binding of textbox to textblock, it works well,

C#

<TextBlock Name="lblText" FontSize="{Binding ElementName=txbValue, Path=Text, Mode=TwoWay}" Height="23" HorizontalAlignment="Left" Margin="20,20,0,0" Text="TextBlock" VerticalAlignment="Top" />
<Slider Name="sldValue" Value="{Binding ElementName=txbValue, Path=Text, Mode=TwoWay}"  Height="23" HorizontalAlignment="Left" Margin="20,60,0,0"  VerticalAlignment="Top" Width="200" Minimum="1" Maximum="40"/>
<TextBox Name="txbValue"  Height="23" HorizontalAlignment="Left" Margin="20,100,0,0" VerticalAlignment="Top" Width="120" />

Posted 20-Aug-13 17:20pm

Rence Y

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Marvin Ma · Answer 1 · 2013-08-21T00:34:00

Try this:

XML

<StackPanel>
            <TextBlock x:Name="Text" Text="Example" FontSize="{Binding ElementName=TextBox, Path=Text}"/>
            <Slider x:Name="Slider" Value="{Binding ElementName=TextBox, Path=Text}" Minimum="10" Maximum="50"/>
            <TextBox x:Name="TextBox" Text="{Binding ElementName=Slider, Path=Value}"/>
        </StackPanel>

FontSize of TextBlock changes when typing a number in the TextBox and also changes when moving the slider.
Hope this is the solution to your problem.