C# - Abspielen von MP3's

using System.Diagnostics;
		
[DllImport("winmm.dll")]
private static extern long mciSendString(string strCommand, StringBuilder strReturn, int iReturnLength, IntPtr hwndCallback);
public string befehl;


private void btn_laden_Click(object sender, EventArgs e)
{
	if (openFileDialog1.ShowDialog() == DialogResult.OK)
	{		
		label1.Text = openFileDialog1.FileName;
		befehl = "open \"" + label1.Text +"\" type MPEGVideo alias MediaFile";
		mciSendString(befehl, null, 0, IntPtr.Zero);
	}
}

private void txt_Abspielen_Click(object sender, EventArgs e)
{
	befehl = "play MediaFile from 0";
	mciSendString(befehl , null, 0, IntPtr.Zero);
}