using System;

public class Program

{

    public static void Main()

    {

        dynamic a = "DynamicString";

        object b = "ObjectString";

        Console.WriteLine(a.GetType());

        Console.WriteLine(b.GetType());

        Console.WriteLine(a.ToLower());

        //Console.WriteLine(b.ToLower()); //Compilation error

        Console.WriteLine(((String)b).ToLower());

    }

}