merge projects when deploy

[CMA]

hi all,

I'm having a problem of deploying.

here I'm explaining why, how, what is doing.

we have common set of pages where login, logout.. etc (called application
framework)
we have set of modules.
these modules need to be develop separately and tested. so we add one module
to the application framework and do the coding, testing...etc.

finally we deploy through COPY PROJECT option in the .NET IDE and merge all
modules with application framework.

when we run the application, it says...

"CS1595 : 'Class' is defined in multiple places"

is there any good method to merge?

regards,
CMA