using System;

​

interface IInterface

{

    string Method();

}

​

class Base : IInterface

{

    public string Method()

    {

        return "Base";

    }

}

​

class Derived : Base

{

    public new string Method()

    {

        return "Derived";

    }

}

​

class DerivedWithInterface : Base, IInterface

{

    public new string Method()

    {

        return "DerivedWithInterface";

    }

}

​

class BaseExplicit : IInterface

{

    string IInterface.Method()

    {

        return "BaseExplicit";

    }

}

​

class DerivedFromExplicit : BaseExplicit

{

    public string Method()

    {

        return "DerivedFromExplicit";

    }

}

​

class DerivedWithInterfaceFromExplicit : BaseExplicit, IInterface

{

    public string Method()

    {

        return "DerivedWithInterfaceFromExplicit";

    }

}

​

​

public class Program

{

    static void Test(IInterface iface)

    {

        Console.WriteLine("{0}: {1}", iface.ToString(), iface.Method());

    }

    public static void Main()

    {

        Test(new Derived());

        Test(new DerivedWithInterface());

        Test(new DerivedFromExplicit());

        Test(new DerivedWithInterfaceFromExplicit());

    }

}