Fishing for more info... Optional Arguments

I have read that passing Optional Arguments now need to contain a default value.

Can the default value be Empty, Null etc?

Code:

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Sub foo(Optional ByVal y As Integer = Null)

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Yes, you can still use Optional Parameters, but you have to specify the default value. This is required because IsMissing function is no longer supported.

VB Code:

Public Function MyFunct(Optional MyParam As Integer = -1) As Boolean

You can also achieve this by using function overload. I personally like function overload better then optional parameters.
Actually, the only reason Optional Parameters existed in previous versions of VB is because there was no function overload feature.