Is it possible to send audio (.wav)file into separate channels in 5.1 & 7.1 audio card ? if it is possible then how to do by using ?

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C#

I'm using Microsoft.DirectX.DirectSound.dll

here we have only Boolean type checking 5point1,7point1, mono, stereo etc.
but for we required is
if audio card is 7.1
then there 8 channels front left, front right, center, rear left, rear right, side left, side right and a subwoofer.
now I want to send particular audio file into particular channel only. So how to do if any body knows reply........... (Note:emergency required).




Ex:
Mode5point1
Channel count is set to 6. 5.1 speaker setup. This includes front left, front right, center, rear left, rear right and a subwoofer.

Mode7point1
Channel count is set to 8. 7.1 speaker setup. This includes front left, front right, center, rear left, rear right, side left, side right and a subwoofer.