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When registering .NET assemblies for COM Interop, I do two things, currently in this order:
regasm /tlb:MyDll.tlb Mydll.dll
gacutil /i Mydll.dll
I use regasm to register the type library for COM and gacutil to install the assembly into the GAC. Does it matter which order I do these two actions? Also, as I make updates to my dll, do I need to un-register and re-register it, uninstall it from the gac and re-install it, both or neither?
No.
Yes.
That depends. If you added new types in your COM dll, then yes. If you only changed a few internal things in existing types, then no. To be safe though, always un-register and re-register.