No there's not. I write some samples/tests/demos in C# and some in VB - some of them I share publicly, some I don't. None are supported, all are free.
Personally I recommend the Instant C# and Instant VB products from Tangible for people who choose to be mono-lingual. These conversion tools do a really good job (not perfect, but really good) of converting projects, files or bits of code between the languages.
CSLA couldn't exist in both languages without these tools (because even though I'm multi-lingual, I surely don't have the time to write everything twice!)
Copyright (c) Marimer LLC