public class Program

{

    public static void Main()

    {

        dynamic obj = GetObject(); // ★

        string str;

        if ((obj != null) && ((str = GetString()) != null)) // ◆

        {

            System.Console.WriteLine(obj + str); // ▲

        }

    }

​

    static object GetObject()

    {

        return "hello";

    }

​

    static string GetString()

    {

        return "goodbye";

    }

}

​