Has,Contains,Is a part of(UML desingning in C#)

[mehdi62b]

Hi Experts,
I want to implement HAS in C#,I think I should use private nested class for this relation,or whetere other things are possible?
for example a car Has door,motor,pedal,...

public class car
{
   private Motor motor=null;
   class Motor{
   }
   private Pedal pedal=null;
   class Pedal{
   }
   private Door door=null;
   class Door{
   }
}

am I right?
if I declare Door,Pedal,Motor classes outside the car class,does it make sence?