Have ReSharper keep 'using System;' when optimizing usings

Question

I was wondering if there is some option to keep ReSharper from removing just the using System; directive? Perhaps this is configurable somewhere?

Also, is t

Answer 1

Yes, in the options (Resharper > Options > Languages > C#), there is a Namespace Imports section that allows you to specify namespaces that should never be removed. You would put System into the prompt it gives.