x: in front of the button in Silverlight?

Wh开发者_StackOverflow中文版at is the difference between these 2 lines? Visually I haven't noticed anything different. Sorry I am just getting started with Silverlight.

<Button Content="Click me" Name="myButton" FontSize="18" Width="150" Height="45" />

and

<Button Content="Click me" x:Name="myButton" FontSize="18" Width="150" Height="45" />

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Nothing (see the remarks in particular).