Cannot play local WMV in silverlight MediaElement

I am trying to play a video in WMV format in a silverlight MediaElement.

<StackPanel>
  <Grid x:Name="LayoutRoot">
        <MediaElement x:Name="media" Source="Bounce.wmv" 
         Width="300" Height="300" AutoPlay="True" />
  </Grid>
</StackPanel>

This does nothing.. but if I change the source attribute to point to some WMV out on the web it works.

What am I doing wrong? I have the th开发者_StackOverflow社区e movie in the same directory as the MainPage.xaml

Well, it would depend on what page you are calling it from. If you are calling from a different XAML page that is in a sub-directory, like Views, you'll need to change the Source to a relative path. Give Source="\Bounce.wmv" and Source="..\Bounce.wmv" a try, depending on the folder structure you are in when calling it.