Congratulations!!! Please post pics. Gen2 C models are pretty rare, only made for a short time. Check out the Glock serial number research thread in the valuable information threads to find more information.
As far as value, it's hard to say. Some people wouldn't give any more than any other used Gen 2 .40, while others are aware of how rare the Gen 2 C models are and would pay more to add it to their collections (myself included). You may want to ask the question in the collectors forum to get information.