Replacing a DLL when AppDomain is already loaded in ASP.NET

Question

What happens if the dll is already loaded w3wp.exeand we replace it?

Of course, we can replace the dll, since asp.net uses the cached version of the DLLs Bin, but I want to know whether, when replacing the dll, it will load a new one or wait until the next reprocessing or when there is no new request.

EDIT: DLL contains a singleton class

Answer 1

From MSDN :

.dll Bin, ASP.NET .dll .

Answer 2

dll.

, - bin .