It’s worth knowing how the Castle Windsor IoC work, by default it uses Singletons, where this will work for the most of the time, there are a lot more options available to you depending on your needs.  These lifestyles that are available in Castle Windsor are:

• Singleton: components are instantiated once, and shared between all clients
• Transient: components are created on demand
• PerWebRequest: components are created once per Http Request
• Thread: components have a unique instance per thread
• Pooled: Optimization of transient components that keeps instance in a pool instead of always creating them
• Custom: allows you to specify a custom lifestyle… you’d have to specify a type that implements the ILifeStyleManager interface

For further information on this take a look at Castle Windsors Lifestyles or  Windsor and component instance lifetimes