accessability in CSharp

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inheritance

Hi,
please see the below code...

public class A{
    public void method1() { }
    public void method2() { }
    public void method3() { }        
    public void method4() { }
}   
public class B:A{}
public class C:A{}

now I want that only method1 and method2 should be accesible when I create the object of class B and same way only method3 and method4 should be accesible when I create the object of class C. what I need to do to achive this scenario??