You can use Gacutil.exe to add strong-named assemblies to the global assembly cache and to view the contents of the global assembly cache.Gacutil.exe is only for development purposes and should not be used to install production assemblies into the global assembly cache.
At the command prompt, type the following command:
gacutil –I <assembly name>
In this command, assembly name is the name of the assembly to install in the global assembly cache.
Eg.
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