Summary
In order to share assemblies --i.e. a Dynamic Link Library-- across applications, the assembly must be registered with the Global Assembly Cache. The Global Assembly Cache is a machine-wide code cache that is installed with the Common Language Runtime.

1. Sign the DLL in Project Properties.
   


2. Delete the files in the bin/Release Folder of the project so that the folder is empty.


3. Compile the DLL in Release Mode.
   


4. Open Developer Command Prompt for Visual Studio using Run As Administrator.


5. Navigate to the bin/Release directory where the newly compiled DLL is located, and run the gacutil install command on the DLL.
   


6. Verify that the DLL is now installed in the Global Assembly Cache by going to C:\Windows\Microsoft.NET\assembly\GAC_MSIL\SampleClassLibrary and finding the DLL in the folder that has the Assembly Version Number in it, i.e. C:\Windows\Microsoft.NET\assembly\GAC_MSIL\SampleClassLibrary\v4.0_1.0.0.0__d2a1a2dfb0150482\SampleClassLibrary.dll.


7. Open an EXE Project and add the DLL Reference to the EXE.
   


8. Set the Copy Local Property of the DLL to False.
   


9. The SampleClassLibrary DLL can now be used in the SampleEXEProject Application.


10. To Add the SampleClassLibrary DLL to other applications, add the DLL Reference and set the Copy Local Property to False.


11. Be sure to increment the Assembly Version Number when changes are made to the SampleClassLibrary DLL.


12. DLL's can be removed from the Global Assembly Cache by running the gacutil /u command, i.e. gacutil /u SampleClassLibrary. This command will uninstall all of the versions of the DLL from the Global Assembly Cache.