selftest

I am trying to run the selftest on the NI6514 DIO module in Visual Studio C# using the.NET interface for the NationalInstruments.DAQmx. When I looked at the prototype it shows:

       void selftest();

So there seems to be no way to get the test results back form the self test call. I looked at the equivalent C function call template and it is expecting an integer to be returned.

Is this a bug or am I missing something?