Andrej Tozon discusses the optional parameters that are now available in Silverlight 4.
Named & optional parameters are a new C# language feature coming up with .NET FX 4.0 and guess what… it’s in Silverlight 4 as well!
Optional parameters will come very useful when defining complex APIs where you would usually have to provide several overloads for the same method for it to make sense to wide variety of usages.