LabVIEW supports ActiveX. For more information on how to make calls to your ActiveX DLL in LabVIEW please see the ActiveX topic in the online help for LabVIEW.
Because .NET technology was released after LabVIEW 6.1, LabVIEW does not yet support .NET native components.
Regards,
Amaury Rolin,
NI Applications Engineer