using System;

public class Program

{

    public static void Main()

    {

        var o = new RPM();

        if (!(o is IDataType))

        {

            Console.WriteLine("Nope!");

        } else {

            Console.WriteLine("Yes, same same, but different!");

        }

    }

}

​

class RPM : IDataType

{}

​

interface IDataType

{}

​