I am not asking how to add a DLL to a solution. that is not what I am asking at all. I am asking how to add a DLL project to a solution.
This:
http://larsjacob.wordpress.com/2010/06/15/use-a-dll-library-in-visual-studio-2010/
and this:
http://msdn.microsoft.com/en-us/library/vstudio/wkze6zky.aspx
Does not answer my question. I am already using the DLL in the project.
I have a problem where there is a bug in the DLL source code. So I have to add the project of the DLL into the same solution where the current project resides.