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Is C# 4 optional parameter implementation the same as VB.NET, the optional parameter is compiled on the call site(can cause versioning problems)?
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Yes.
According to SamNg, C#'s default arguments are is compiled at the call site, similar to default parameters in C++.
Yes, it would cause versioning problems. However, optional parameters should be used where it makes sense. In many cases, this means passing
nullor default-constructed class to a method or constructor.