Using properties from one class in another class

Question

I have a class A which has 2 other classes B & C inside it.

 Each of those classes has properties .  i want to use these properties in another class. how can this be done?

 

public class A   

{ 

public class B      { public int id{ get; set; }         public string name{ get; set; } public year { get; set; } } 

public class C      { public string name { get; set; }}

 }