WPF MediaElement is not playing the uri passed to it

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WPF

C#3.5

media

C#5.0

Am using MediaElement in my program.

<MediaElement MediaEnded="MediaEnded" MediaOpened="MediaOpened" LoadedBehavior="Manual" Visibility="Hidden"   Height="230" HorizontalAlignment="Right" Margin="0,0,13,82" Name="MediaPlayer" VerticalAlignment="Bottom" Width="457" Opacity="1" AllowDrop="True" Stretch="Uniform" IsMuted="False" />

And in the back end am assigning the media uri to this MediaElement as like the following.

MediaPlayer.Source =new Uri(@"L:\Melody Hits\1. 03 - Teri Yaadon Mein.mp3",UriKind.Relative); // it does not playing
// no error or exception is throwing

If i give like the following:

MediaPlayer.Source =new Uri(@"L:\Melody Hits\TERE_BIN.mp3",UriKind.Relative);

then it works great.

I had identified that the problem is with the name of the file which i am giving, if the file name contains any special characters then it doesn't work. how can i solve this problem