using System;

public class Program

{

    public static void Main()

    {

        var a = new string[] {"A", "B"};

        var b02 = new string[] {"C", "D"};

        var a01 = "Hello";

        var a02 = "Yo";

        var b = a;

        var b01 = a01;

        ABaseClass c01 = new AInstanceClass();

        b[0] = "C";

        b01 = "BYE";

        //c01 = 

        A(a02);

        B(b02);

        Console.WriteLine(a[0]);

        Console.WriteLine(a01);

        Console.WriteLine(a02);

        Console.WriteLine(b02[0]);

        Console.WriteLine(c01.GetIt());

    }

    public static void A(string a){

        a = "AA";

    }

    public static void B(string[] b){

        b[0] = "BB";

    }

}

​

public class ABaseClass {

    public virtual string GetIt() {return "A Base";}

}

​

public class AInstanceClass : ABaseClass {

    public override string GetIt() {return "A Inastance";}

}

​

​

​