public IEnumerable<T> GetInstances()
        {
            List<T> objects = new List<T>();
            foreach (Type type in
                Assembly.GetAssembly(typeof(T)).GetTypes()
                .Where(myType => myType.IsClass && !myType.IsAbstract && myType.IsSubclassOf(typeof(T))))
            {
                objects.Add((T)Activator.CreateInstance(type));
            }
            return objects;
        }