If I want to compile my .NET applications for a 64 bit environment. Do I need
- 64 bit OS version
or - 64 bit Visual Studio version
Or both?
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You actually need neither of those for building the application. A pure .NET 2.0+ application will — in the absence of specific compiler flags to the contrary — run as a 64-bit application under a 64-bit OS and as a 32-bit application under a 32-bit OS.
Edit: Also, there’s no such thing as a 64-bit version of Visual Studio.