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Executing and then deleting a DLL in C #

I am creating a self-updating application where I have most of the code in a separate DLL. This is the command line and will eventually be run on Mono. I'm just trying to get this code to work in C # on windows on the command line.

How can I create a C # application that I can remove the supporting dll during its launch?

AppDomain domain = AppDomain.CreateDomain("MyDomain");
ObjectHandle instance = domain.CreateInstance( "VersionUpdater.Core", "VersionUpdater.Core.VersionInfo");
object unwrap = instance.Unwrap();
Console.WriteLine(((ICommand)unwrap).Run());
AppDomain.Unload(domain);
Console.ReadLine();

in ReadLine the VersionUpdater.Core.dll file is still locked from deletion

The ICommand interface is located in the VersionUpdater.Common.dll file, which is referenced by both the Commandline application and VersionUpdater.Core.dll

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