How do I use the silverlight video player?

Hi,

I am attempting to create a silverlight application within visual studio 2008 that will play an mp4 video file. I have downloaded the visual studio silverlight extensions and tools and the silverlight sdk 3.0. I have downloaded the SMF dll files (Microsoft.SilverlightMediaFramework.dll, Microsoft.SilverlightMediaFramework.Player.dll, Microsoft.Web.Media.SmoothStreaming.dll) and referenced these within my application. My MainPage.xaml looks like the attached but when I run my application I get a "visual studio must close error"? Can I not reference mp4 files like I have within my xaml page? How do I play mp4 files through a silverlight application for my users to view online? I've read about the MediaPlayer control but I believe that is now out of date....shame, as that approach seemed simple.

Any help appreciated,

Martin.

<UserControl x:Class="PetexSilverlightApplication.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:p="clr-namespace:Microsoft.SilverlightMediaFramework.Player;assembly=Microsoft.SilverlightMediaFramework.Player"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">
  <Grid x:Name="LayoutRoot" Background="White">
        <p:Player>
            <p:CoreSmoothStreamingMediaElement
                AutoPlay="True"
                SmoothStreamingSource="C:\asp.net\Visual Studio 2008\Petex\SilverLight\PetexSilverlightApplication\PetexSilverlightApplication.Web\App_LocalResources\PETROLEUM EXPERTS.mp4"
                />
        </p:Player>
            
    </Grid>
</UserControl>

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