How can you use optional parameters in C#?

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Surprised no one mentioned C# 4.0 optional parameters that work like this:

public void SomeMethod(int a, int b = 0)
{
   //some code
}

Edit: I know that at the time the question was asked, C# 4.0 didn’t exist. But this question still ranks #1 in Google for “C# optional arguments” so I thought – this answer worth being here. Sorry.

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