This article provides help for those wishing to use the 64 bit version of DicomObjects from Visual Studio (for development in any supported language, including C# or C++)
Visual Studio is itself a 32 bit application, even when it is compiling a 64 bit application, which uses a 64 bit OCX. Therefore, it cannot ITSELF access the 64 bit OCX for intellisense, #import etc. The standard requirements for using 64 bit COM component in Visual Studio is that a 32 bit version with the same interfaces must be registered on the development machine (this is not of course needed for subsequent execution).
For deployment and distribution of your 64bit application, only DicomObjects 64 bit is needed.