MediaPlayer shuffle is not random

[antidinosaur]

I used the MediaPlayer library in my code to play a list of musics. I want the sequence to be random. However, the shuffle function did not give me any randomness. Here is my code snippet:

public partial class FrmGameOption : Form
{

public WMPLib.WindowsMediaPlayer wplayer = new WMPLib.WindowsMediaPlayer();

wplayer.controls.stop();
System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(
@"music\map\");

FileInfo[] files = dir.GetFiles();
WMPLib.IWMPPlaylist playlist = wplayer.playlistCollection.newPlaylist("myplaylist");
foreach (System.IO.FileInfo file in files)
{

WMPLib.IWMPMedia media;
media = wplayer.newMedia(file.FullName);
playlist.appendItem(media);
}
wplayer.currentPlaylist = playlist;
wplayer.settings.setMode("shuffle", true);
wplayer.settings.setMode("Loop", true);
wplayer.controls.play();

}

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