Introduction
In this blog I 
have taken on slider, one textbox and one textblock controls. this code example 
uses value of slider for setting the text of textbox and for increasing the font 
size value of textblock
to do the above 
task, I have use the Element Binding 
XAML Code
<Window 
x:Class="Example02.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Example 
01" Height="300" 
Width="300">
<Grid>
<Grid.RowDefinitions 
>
<RowDefinition 
Height="60px" />
<RowDefinition 
Height="40px" />
<RowDefinition 
Height="40px" />
<RowDefinition 
Height="*" />
</Grid.RowDefinitions>
<ComboBox 
Name="FontNameList" 
ItemsSource="{Binding 
Source={x:Static 
Fonts.SystemFontFamilies}}" 
Height="22" 
SelectedIndex="22" 
Grid.Row="0"/>
<Slider 
Name="fontSizeSlider" 
Minimum="5" 
Maximum="100" 
Value="10" 
Grid.Row="1" />
<TextBox 
Name="SizeTextBox"
Text="{Binding 
ElementName=fontSizeSlider, 
Path=Value}" 
Grid.Row="2"/>
<TextBlock 
Text="Example 01" 
FontFamily="{Binding 
ElementName=FontNameList, 
Path=Text}" 
FontSize="{Binding 
ElementName=SizeTextBox,
Path=Text}"
Grid.Row="3"/>
</Grid>
</Window>