Example on the use of event keyword in C#

GameMode.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ExampleEvent
{
    public class PlayerConnectedEventArgs : EventArgs
    {
        public string PlayerName { get; set; }
        public string Message { get; set; }
        public int Id { get; set; }
    }

    //Publisher class
    public class GameMode
    {
        public EventHandler<PlayerConnectedEventArgs> PlayerConnectedEvent;

        public void OnPlayerConnected(PlayerConnectedEventArgs args)
        {
            PlayerConnectedEvent?.Invoke(this, args);
        }
    }
}

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ExampleEvent
{
    public class MethodClass
    {
        public void OnPlayerConnected(object sender, PlayerConnectedEventArgs e) 
        {
            Console.WriteLine($"{e.PlayerName} has joined the server!");
        }
    }

    class Program
    {
        static void Main()
        {
            var sample = new MethodClass();
            var gamemode = new GameMode();
            //gamemode.PlayerConnectedEvent.Invoke("", ""); --> error
            gamemode.PlayerConnectedEvent += (sender, e) => Console.WriteLine($"{e.PlayerName} {e.Message}");
            gamemode.PlayerConnectedEvent += sample.OnPlayerConnected;

            gamemode.OnPlayerConnected(new PlayerConnectedEventArgs()
            {
                Id = 1,
                PlayerName = "MrDave1999",
                Message = "se conectó al servidor."
            });

            gamemode.OnPlayerConnected(new PlayerConnectedEventArgs()
            {
                Id = 2,
                PlayerName = "Pepito",
                Message = "se conectó al servidor."
            });

        }
    }
}