•  Open Visual Studio Command Prompt
•  Type gacutil/i  [Drive_Name]:\[Folder_Name]\[Assembly_Name].dll

After following these steps you will get a message like this “Assembly successfully added to the cache” on visual studio command prompt window

And we can check that this assembly has been successfully deployed in GAC folder that is global assembly cache folder. We can open this folder by navigation C:\Windows\assembly directory.