using System;

​

public class Program

{

    public static void Main()

    {

        var tb = new TestBase();

        Console.WriteLine("[Base] Hello, it's " + tb.TestMethod());

        var tn = new TestNew();

        Console.WriteLine("[New] Hello, it's " + tn.TestMethod());

    }

}

​

public class TestBase

{

    public int TestMethod() => 1;

}

​

public class TestNew : TestBase

{

     public new int TestMethod() => 2;

}