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vb.net - What is allowed in Visual Basic that's prohibited in C# (or vice versa)?

This is code-related as in what the compiler will allow you to do in one language, but not allow you to do in another language (e.g. optional parameters in VB don't exist in C#).

Please provide a code example with your answer, if possible. Thank you!

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VB.NET has support for CIL Exception Filters, C# doesn't:

Try 
  ...
Catch ex As SomeException When ex.SomeProperty = 1
  ...
End Try 

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