Try downloading the binaries and application from here...
http://www.codeproject.com/Articles/258779/Just-launched-new-open-source-project-QrCode-Net-a
...and use the Gma.QrCodeNet.Demo.exe executable to generate some QR Codes and see if your phone can decipher them.
If it can, I am going to try to figure out how to use the accompanying Gma.QrCodeNet.Encoding.dll.
I have tried before, but got nowhere. Maybe this time will be different.