Do you want to know how to use VB to read a DAQ board provided by National Instruments or how to interface your VB program to a LabVIEW program that is reading the DAQ board? If it's the first, I believe there are VB examples included with NI-DAQ and there are some VB programming examples
here. There is also a
Visual Basic Forum and a
DAQ Forum that you
would have better luck posting to. For interfacting to a LabVIEW app, it depends. There are ActiveX techniques and a LabVIEW program can also be made into a DLL.