using System;

​

public interface IThing

{

    protected string Method1() => "ISample.Method1";

​

    protected string Method2();

}

​

public class Thing : IThing 

{

    string IThing.Method2() => Method2();

    protected string Method2() => "Sample.Method2";

    public void DumpMethod2() => Console.WriteLine(this.Method2());

}

​

public class Program

{

    public static void Main()

    {

        new Thing().DumpMethod2();

    }

}