visual studio 2015, VISA, example

I'm implementing som instrument controls though VISA / C#.

I'm uisng Visual Studio 2015.

I've read about some issues with this combination.

I can't reference NationalInstruments.VisaNS, where is it ?

I can reference NationalInstruments.Visa, is that the same ?

Can anyone provide a basic working example of some C# code made in visual studio 2015 ?

It just has to readout *IDN? via usb

br

Nikolaj