Playing MP3 files

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C#

Hi,
For playing an MP3 file, I use this code in C#:

playCommand = "open \"" + textBox1.Text + "\" type mpegvideo alias MediaFile";
mciSendString(playCommand, null, 0, IntPtr.Zero);
playCommand = "play MediaFile";
mciSendString(playCommand, null, 0, IntPtr.Zero);

It works for all musics and videos and even images such as:
wav, wmv, jpg

But it works for no mp3 file!
All my mp3 files can be played by "Windows Media Player" but not by my C# winform application.

What should I do?