I have always wanted this to be true and it seems like it is going to be! 
I know; some time ago AppForge CrossFire was able to do that, however for some reason, it was discontinued and its intellectual property was sold to Oracle. At the time, I was new into these things and didn’t have the chance to try it out.
However, it seems that I have another chance now! The company redFIVElabs has released a product named Net60 that enables mobile application developers to use the .NET Compact Framework 1.0 to develop applications targeting the broad range of S60-based Nokia smartphones.
You can try out the trial application at here. For .NET developers out there, this is their best bet, since there is no built-in support for using .NET to develop mobile applications that run on Symbian devices.
