If it's failing with MySQL, it may be something wrong with your VS.NET install. I'm actually not using Beta 2. I'm using the CTP from August (I think). The version I have is v8.0.50727.7 (RTM.050727-700). What version are you using?
I'm using an ODBC connection. The
VB.NET is not very friendly to calling unmanaged code (like the Btrieve API).