public class LifecycleSingleton {
    public IContainer Container;

    public LifecycleSingleton() {
         Container = new Container(x => x.For<IClassX>().LifecycleIs(new SingletonLifecycle()).Use<ClassX>());
         Container = new Container(x => x.For<IClassX>().Singleton().Use<ClassX>());
    }
}