>Keith,
>
>Thanks for the reply, and sorry I didn't acknowledge earlier.
>
>However, I am still developing the application module, including the COMMON project. i don't know if placing it in the Global Assembly cache will be possible, since I will need to make modification as the project progresses.
>
>Alfred

Alfred,

You can develop it side-by-side with the other projects using a project reference to link to the dll. Once you are ready to release the projects, create a deployment package for the common project that installs it into the GAC. Run the deployment package, then update the references in the other projects to use the GAC for the dll.

IOW, keep everthing as-is until development is complete. Then install the common project into the GAC of the development system and change the references in the other projects to use the GAC.