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 f
VS2008 adds several files to the bin directory [...]Do they need to be added in source control?
Nothing in the bin directory needs to be added to source control. One of the first thing when initially checking in a project is to ignore the bin and obj directories. So yes, you can delete these files, but Visual Studio will recreate them.