NuGet caches downloaded packages to avoid lengthy update times. Sometimes, however, restoring packages (such as a CI server) can become problematic. Below is an easy method of clearing your cache to help debug restore issues.
By default, when you compile a Web application the compiled code is placed in the Temporary ASP.NET Files folder. This folder is a subdirectory of the location where you installed the .NET framework.
If you're seeing strange caching behavior either in the Console or in WebAccess and an IISreset is not correcting your problem you can try to clear the Temporary ASP.NET Files.