You won't find a DDS codec pack anywhere. DDS is a proprietary format from Microsoft. You probably have two options right now. First is go and check out the SDK from NVidia which if I remember correctly can read DDS files and has a .NET library. Your second option is using DirectX and one of the many managed DirectX wrapper libraries for .NET considering a DDS is a DirectDraw Surface file. I've had good experiences with the tiny SlimDX library.
A quick google also turned up this:

. Depending what file format it is, it may help you.
If you need any more help, I'll be back around in a day and can post some code from one of my projects.
-jD