Shadow effect by creating an outer glow
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<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="SDKSample.Window1" Title="Text Shadow Samples"
Background="FloralWhite">
<StackPanel>
<TextBlock FontSize="64" Text="{Binding Path=Text, ElementName=textblockMaster}"
Foreground="SteelBlue" Grid.Column="1" Grid.Row="4">
<TextBlock.BitmapEffect>
<OuterGlowBitmapEffect
GlowSize="1.0"
GlowColor="Orange"
Opacity="1.0"/>
</TextBlock.BitmapEffect>
</TextBlock>
</StackPanel>
</Window>
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