Right click your solution object and go to Properties. On the left panel,
select Configuration Properties and then Configuration. You should see a list
of all your projects here. Make sure there is a check mark in the Build
column for only the projects that you want to compile. For the ones you do
not want to compile, uncheck the box.

Remember that there are two ways to compile a project: as DEBUG and as
RELEASE. Depending on which setting you have selected you could have
different compile configurations so make sure you set it up for both cases.

Adrian.