Soundplayer class not playing sound

Hi,
I have tried the SoundPlayer class in ASP.NET used to give alert when it reachs threshold (value has been set).
When i directly complied from VS2008 its working mean it gives alert sound. But while i open browser the type "localhost/website/default.aspx" in the address bar its not playing (any sound).
My code is here
SoundPlayer objSoundplayer = new SoundPlayer(path);
objSoundplayer.LoadAsync();
objSoundplayer.Play();
objSoundplayer.PlayLooping();
Working with portnumber : localhost:55678/website/default.aspx
Not Working: localhost/website/default.aspx
What worng in this code or need to inculde some more properites.
anyone help please... its urgent......
 
Thanks in advance
...