Can you use optional parameters in code targeting .NET 3.5?

Question

I\'m looking to write a library that uses the new optional parameters feature of C# 4.0, but I want to target it to the 3.5 version of the framework. Is this possible?

Answer 1

VS 2010 supports optional parameters in C# for .NET 3.5 solutions. One caveat however, is that the command-line compiler will report errors.

So, if you have automated builds in running, - using NANT or something else using the command-line compiler - your builds will fail.