using System;

​

public class Program

{

    public static void Main()

    {

        int option = 2;

        switch (option)

        {

            case 1:

                string msg = "selected one";

                Console.WriteLine($"Hello World :{msg}");

                break;

            case 2:

                msg = "selected two";

                Console.WriteLine($"Hello World :{msg}");

                break;

            default:

                msg = "nothing selected.so default";

                Console.WriteLine($"Hello World :{msg}");

                break;

        }

    }

}