I have developed Data Acquisitions applications using NI-DAQ (6.6) and C++, I want to develop the same applications but using C# (.NET) and an earlier version of NI-DAQ (7.x)
Yes, you can program DAQ applications in C# .NET. Simply refer to this KnowledgeBase entry for more information about getting started. http://digital.ni.com/public.nsf/websearch/F0FD13D2DD0C433986256D9C00468D29?OpenDocument. Have a great day!