Question : .NET Solution With multiple projects

I have a solution that is used for many departments.  Currently there are about 8 projects in this solution.  I have one that holds all the Business Objects that these other projects will use.  When I make a change to the Business Objects I have to recompile everything.  This is a pretty big pain, especially since I could make a change, test and have to make another one right away.  I swear I spend an hour recompiling each day.  I tried to get around this by having all the projects reference a dll instead of a project but I still have the issue of having to recompile it all.  This actually takes longer because I have to remember the build order myself.  Is there a way I can compile my Business Objects project and the other projects don't have to get recomipled as well but know of this change?  

Answer : .NET Solution With multiple projects

If the ide didn't see the newer code, than we would have a problem. Our product consist over more than 600 .net projects !

Example of our postbuild-event:
copy /y $(TargetName).dll "..\..\..\..\..\_OutputPath"
copy /y $(TargetName).pdb "..\..\..\..\..\_OutputPath"
gacutil /if "$(TargetPath)"