using System;

public class Program

{

    public static void Main()

    {

        A a = new B();

​

        a.WriteC();

    }

}

​

​

​

public class A 

{

    public string CString { get { return "a"; } }

    public virtual void WriteC(){

        Console.WriteLine(this.CString);

    }

}

​

public class B : A

{

    public new string[] CString { get { return new string[] {"b", "B"}; }}

    public override void WriteC(){

        Console.WriteLine(this.CString);

    }

}