Example 1: Simple Command Pattern

using System;

// Command interface
public interface ICommand
{
    void Execute();
}

// Concrete command
public class LightOnCommand : ICommand
{
    private Light _light;

    public LightOnCommand(Light light)
    {
        _light = light;
    }

    public void Execute()
    {
        _light.TurnOn();
    }
}

// Receiver
public class Light
{
    public void TurnOn()
    {
        Console.WriteLine("Light is turned on");
    }

    public void TurnOff()
    {
        Console.WriteLine("Light is turned off");
    }
}

// Invoker
public class RemoteControl
{
    private ICommand _command;

    public void SetCommand(ICommand command)
    {
        _command = command;
    }

    public void PressButton()
    {
        _command.Execute();
    }
}

class Program
{
    static void Main(string[] args)
    {
        // Client code
        Light livingRoomLight = new Light();
        ICommand lightOnCommand = new LightOnCommand(livingRoomLight);

        RemoteControl remote = new RemoteControl();
        remote.SetCommand(lightOnCommand);

        // Simulate pressing the button
        remote.PressButton();
    }
}