Is the new feature of C# 4.0 - “Optional Parameters” CLS-Compliant?

Optional arguments are "sort-of" CLS-compliant. Methods with optional arguments are legal and can be successfully compiled with the CLSCompliant attribute but callers of those methods don't necessarily need to take account of the default parameter values or the optional attribute. (In which case those methods would behave in exactly the same way as standard methods, requiring that all the arguments be stated explicitly at the call site.).

I interpret your question to be about Optional Arguments.

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