Strings in C# - Declaration and Assignment (String.Empty and null)

Strings.Program.cs

using System;

namespace Strings
{
    class Program
    {
        private static readonly string _message = "Hello World!";

        static void Main(string[] args)
        {
            string name = "Daniel";
            string message = _message;
            string fullName = string.Empty; // ""
            string middleName = null;

            Console.WriteLine(name);
            Console.WriteLine(message);
            Console.WriteLine(fullName);
            Console.WriteLine(middleName);

            Console.ReadKey();
        }
    }
}