Hi Manish,
NI-VISA programming will not work to communicate with your DAQ board. VISA is usually used to communicate with an instrument over some sort of bus like GPIB, serial, USB, etc.
Jens was absolutley correct about the board being supported in DAQmx and being able to program it using VC++. Along with Jens advice, I think you will find the following links very useful:
Programming NI-DAQ in Visual C++ .NET
http://digital.ni.com/public.nsf/websearch/7109C33AB142132E86256D9C004DD7AF?OpenDocument
Programming NI-DAQ in Visual C++ 6.0
http://digital.ni.com/public.nsf/websearch/0087C1E20920F7B986256D9B0061DEE2?OpenDocument
How Do I Install Examples for Visual Basic, Visual C++, and Delphi with NI-DAQ?
http://digital.ni.com/public.nsf/websearch/D60BFBC22980F99D862569B6000EF7CE?OpenDocument
How to Compile and Run NI-DAQ Examples with Microsoft Visual C++
http://digital.ni.com/public.nsf/websearch/C8CC0C1EA6229B09862565E90044DDF3?OpenDocument
E.Lee
Eric
DE For Life!