Edit:
The site listed has been discontinued. I'll leave the old answer here for reference ...
Old answer:
Here is an online converter that will automate the process for you! ...
Varycode online converter
It can do C# to C++ and back again as well as converters for Ruby, Python, Java & VB, apparently!
Edit:
It appears to have had its C++ (and java) functionality removed - it says temporarily, but has done so for a long time now. Hopefully they'll resurrect it soon!
Still works for some other languages (VB, Ruby, Python, Boo).
