Long story short: We've got a system that we're moving from one server to another. At this point, the only issue is that there's an assembly missing on the new box. On the old box, we can see the assembly name, but for the life of us we can't figure out which dll the code is physically in so we can move it to the new box.
Is there some snazzy .net assembly widget that will tell you?
I would use the .NET Reflector to load the main application , then look in the References section to see which assemblies are being referenced.
The assembly name should be the same as the DLL name. (Well, the DLL will have ".dll" on the end of course.) The assembly name is how the CLR works out which file to load!
Do you mean you can see the namespace used for some of the types?
For running code you could start up Process Explorer and in the lower panel look at DLLs, the columns include the path to where a given assembly is loaded from