wpf Styles in WPF Defining a named style
Example
A named style requires the x:Key property to be set and applies only to elements that explicitly reference it by name:
<StackPanel>
<StackPanel.Resources>
<Style x:Key="MyTextBlockStyle" TargetType="TextBlock">
<Setter Property="Background" Value="Yellow"/>
<Setter Property="FontWeight" Value="Bold"/>
</Style>
</StackPanel.Resources>
<TextBlock Text="Yellow and bold!" Style="{StaticResource MyTextBlockStyle}" />
<TextBlock Text="Also yellow and bold!" Style="{DynamicResource MyTextBlockStyle}" />
<TextBlock Text="Plain text." />
</StackPanel>
