How to GAC a DLL when any changes are made in AX 2012

Gac a DLL, when any changes are made in the DLL? 

1. Open Visual studio x64 Win 64 Command prompt----> as administrator.
2. Command : gacutil -i <path-of-dll-with-name> (i-install, u-uninstall).

Ex: gacutil -i C:\Users\Administrator\Desktop\Demo.dll