Reference VS value type

using System;

namespace ObjectFun {
    class Player {
        public string PlayerName { get; set; }
    }

    struct PlayerStruct {
        public string PlayerName { get; set; }
    }
    class Program {
        static void Main() {
            var player = new Player {PlayerName = "Test1"};
            var player2 = new Player {PlayerName = player.PlayerName};

            player.PlayerName = "New Name";
            Console.WriteLine(player2.PlayerName);

            var player3 = new PlayerStruct { PlayerName = "Test1" };
            var player4 = new PlayerStruct {PlayerName = player.PlayerName};

            player3.PlayerName = "New Name";
            Console.WriteLine(player4.PlayerName);
        }
    }
}