Class Spanning multiple files

How to write a class in C# or VB.NET which spans over multiple
modules (files). Basically we have a team of 4 people and all us
will be writing one class. For version control and development
ease we want this class to span over 4 different physical files.

1. It's not possible
2. It's a bad idea
3. VC# For Yukon will introduce partial types, which would let you do something like this.
4. Even when VC#FY is out, it will still be a bad idea to do it like this.