I need to clarify the following doubts regarding bluetooth 32feet.NET assembly 1. Does it support vista and win 7 ? 2. Does it covers methods defined in Microsoft Bluetooth SDK: http://msdn.microsoft.com/en-us/library/aa362927(v=VS.85).aspx ? 3. Do I need to implement Interop (P Invoke) for these MS Bluetooth SDK to call from C#?

Yup 32feet.NET wraps the MSFT Bluetooth API and Winsock interface, it does the necessary P/Invoking.  See the User Guide if you haven't done so already http://www.alanjmcf.me.uk/comms/bluetooth/32feet.NET -- User Guide.html