command design pattern - c#

// github: https://github.com/ivandrofly
namespace CommandPattern
{
    using System;

    internal interface ICommand
    {
        void Execute();
    }

    internal interface IReceiver
    {
        void TurnOn();
        void TurnOff();
    }

    internal interface IInvoker
    {
        void ExecuteCommand(ICommand command);
    }

    internal class UniversalController : IInvoker
    {
        public void ExecuteCommand(ICommand command) => command.Execute();
    }

    internal class TurnOnCommand : ICommand
    {
        private readonly IReceiver receiver;

        public TurnOnCommand(IReceiver receiver)
        {
            this.receiver = receiver;
        }
        public void Execute()
        {
            Console.WriteLine($"{nameof(TurnOnCommand)} - executed!");
            receiver.TurnOn();
        }
    }

    internal class TurnOffCommand : ICommand
    {
        private readonly IReceiver receiver;

        public TurnOffCommand(IReceiver receiver)
        {
            this.receiver = receiver;
        }
        public void Execute()
        {
            Console.WriteLine($"{nameof(TurnOffCommand)} - executed!");
            receiver.TurnOff();
        }
    }

    internal class SamsungTv : IReceiver
    {
        private bool _isOn;

        public void TurnOff() => _isOn = false;
        public void TurnOn() => _isOn = true;

        public void WatchTv() => Console.WriteLine(_isOn ? "Watching netflix :)" : "Be sad :(");
    }

    internal class LGSmartTv : IReceiver
    {
        public void TurnOff()
        {
            Console.WriteLine("Black screen (Life is not good :()");
        }

        public void TurnOn()
        {
            Console.WriteLine("Display LG + (Life is good)");
        }
    }

    internal class Program
    {
        private static void Main(string[] args)
        {
            SamsungTv samsungTv = new SamsungTv();
            IReceiver lgTv = new LGSmartTv();

            // universal remove controller
            IInvoker urc = new UniversalController();

            // commands
            TurnOnCommand onCmd = new TurnOnCommand(samsungTv);
            TurnOffCommand offCmd = new TurnOffCommand(samsungTv);

            samsungTv.WatchTv();
            urc.ExecuteCommand(onCmd);
            samsungTv.WatchTv();
            urc.ExecuteCommand(offCmd);
            samsungTv.WatchTv();


            Console.WriteLine("press any key to execute command on lg tv");
            Console.ReadLine();

            urc.ExecuteCommand(new TurnOnCommand(lgTv));
            urc.ExecuteCommand(new TurnOffCommand(lgTv));

            Console.ReadLine();
        }
    }
}