using System;

​

public static class Program

{

    public static void Main(string[] args)

    {

        IConsole console = new FirstType();

        Print((dynamic)console);

        console = new SecondType();

        Print((dynamic)console);

    }

​

    public static void Print(FirstType obj)

    {

        obj.Print("zzz");

    }

​

    public static void Print(SecondType obj)

    {

        obj.Print("xxx");

    }

}

​

public interface IConsole

{

    void Print(object value);

}

​

public class FirstType : IConsole

{

    public void Print(object value)

    {

        Console.WriteLine("1: " + value);

    }

}

​

public class SecondType : IConsole

{

    public void Print(object value)

    {

        Console.WriteLine("2: " + value);

    }

}