how to play video using mediaElement in wpf

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WPF

media

My gaming application is required to play countdown video I have ".wmv" video clip. I tried below code

xaml code:

<MediaElement Canvas.Left="374" Canvas.Top="486" Height="265" Name="videoFile" Width="308" LoadedBehavior="Manual"   />

c# code:

videoFile.Source = new Uri("pack://SiteOfOrigin:,,,/Sounds/countdowm.wmv" );
    if (videoFile.HasVideo )
        {
            videoFile.Play();
        }

I get videofile.HasVideo false.Please help me. I am newer to wpf