Visual Studio 2008 - Add Reference <p>When adding a DLL as a reference to an ASP.Net project, VS2008 adds several files to the bin directory. If the DLL is called foo.dll, VS2008 adds foo.dll.refresh, foo.pdb and foo.xml. I know what foo.dll is :-), why does VS2008 add the other three files? What do those three files do? Can I delete them? Do they need to be added in source control?</p>