To install a strong-named assembly into the global assembly cache using the Global Assembly Cache tool (Gacutil.exe)
1. Goto your Visual Studio Command Prompt, right click and Run as Administrator
2. Now You can see your Command prompt Window will appear., go to your source path of Dll, like bin directory of your Project
3. Now type Gacutil /i <Dll Name>.dll
The following steps installs an assembly into the global assembly cache.

