C# winmm.dll mp3 player Fast Forward method?

C# winmm.dll mp3 player Fast Forward method?

I am using winmm.dll to make a basic mp3 player. I have a little problem
with my FFW method... basically nothing happens when I activate it.
You can probably figure what I am trying to do....
the first 6 comment out lines, hold a working sample code, when running my
loop it doesnt work for me, What have I done wrong ?
public void FFW()
{
//string cmd1 = "set MyMp3 time format ms";
//mciSendString(cmd1, null, 0, 0);
//cmd1 = "seek MyMp3 to 8000";
//mciSendString(cmd1, null, 0, 0);
//cmd = "play MyMp3";
//mciSendString(cmd, null, 0, 0);
int ffw5sec = 5000;
while (isPlaying == true)
{
string cmd = "set MyMp3 time format ms";
mciSendString(cmd, null, 0, 0);
cmd = "seek MyMp3 to " + ffw5sec.ToString();
mciSendString(cmd, null, 0, 0);
cmd = "play MyMp3";
mciSendString(cmd, null, 0, 0);
ffw5sec += 5000;
}
}