Are there risks to optimizing code in C#?

Question

In the build settings panel of VS2010 Pro, there is a CheckBox with the label \"optimize code\"... of course, I want to check it... but being unusually cautious, I asked my

Answer 1

In C# the optimization should NEVER break your code.

Instead, with optimizations turned on the compiler produces more compact CIL when translating between C# and CIL.

I observed (and frankly it's interesting!) that the C# compilers from .NET < 2.0 (1.0 and 1.1) produced as good CIL WITHOUT optimizations as later C# compilers (2.0 and later) produce WITH optimizations.