I have been using .NET 4 for a while now but I have to admit I never thought well of optional arguments. My impressions gravitated between

1. method overloading for lazy people
2. hiding hideously designed APIS (Office COM Automation, I am looking at you!)

And so I have not used the feature extensively. But during the last week I have found a couple of usages that I can label as “useful”. Let me tell you about them:

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