问C#内存/分配清理

EN

class ToyBox  
{  
    public List<Toy> Toys = new List<Toy>();  
}  
class Factory  
{  
    public ToyBox GetToys()  
    {  
        ToyBox tb = new ToyBox();  
        tb.Toys.Add(new Toy());  
        tb.Toys.Add(new Toy());

        return tb;  
    }  
}  
main()  
{  
    ToyBox tb = Factory.GetToys();  
    // After tb is used, does all the memory get cleaned up when tb goes out of scope?  
}