Consequences of namespace import

I'm thinking about optimization, and I began wondering if there is a cost to importing namespaces.

For example, if I have a namespace called 'Enemy' and a class inside that namespace, say 'Goomba', are there any benefits/consequences to using one of the following over the other as far as performance or file size is concerned?

Code (CSharp):

1. using Enemy;
2.  
3. Goomba goomba;
4.  
5. Start(){
6.    goomba = new Goomba();
7. }

Code (CSharp):

1. Goomba goomba;
2.  
3. Start(){
4.    goomba = new Enemy.Goomba()
5. }

 

Nope. After it's compiled, these are identical. "using" only matters for code readability.

 

Right on. Good to know. Thanks