Could anyone please give me clear and direct answer about how this three things works together?

I configured IIS so virtual directory AppA is pointed to local directory DirA. I created ASP.NET project, that is pointed to virtual directory AppA and located in local directory DirA.

Then I copied that ASP.NET application from local directory DirA to local directory DirB. And re-pointed virtual pirectory AppA appropriatelly, so it became pointed to local directory DirB.

Question is: Why VS still look for some libraries in local directory DirA? I didn't find any direct paths (pointing to DirA), only virtual paths (pointing to AppA).

Thank you in advance, Aleksey