using System;

public class Program

{

    public static void Main()

    {

        var token = "";

        Console.WriteLine("When token is \"\"");

        Console.WriteLine("Result: " + (!string.IsNullOrEmpty(token) ? token : string.Empty));

        Console.WriteLine("Result: " + token ?? string.Empty);

        Console.WriteLine();

        token = null;

        Console.WriteLine("When token is null");

        Console.WriteLine("Result: " + (!string.IsNullOrEmpty(token) ? token : string.Empty));

        Console.WriteLine("Result: " + token ?? string.Empty);

        Console.WriteLine();

        token = "token";

        Console.WriteLine("When token is something");

        Console.WriteLine("Result: " + (!string.IsNullOrEmpty(token) ? token : string.Empty));

        Console.WriteLine("Result: " + token ?? string.Empty);

        Console.WriteLine();

    }

}