TicTacToe/Box.cs

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

namespace TicTacToe
{
    public class Box
    {
        public Action<int> Pressed;
        public int Index;
        public bool BotOwned = false;
        private Button _button;
        public bool Filled = false;

        public Box(Button button, int index)
        {
            _button = button;
            Index = index;
            button.Click += Clicked;
            _button.Text = "";
        }

        private void Clicked(object sender, EventArgs e)
        {
            Pressed.Invoke(Index);
        }

        public void Destroy()
        {
            _button.Text = "";
            _button.Click -= Clicked;
        }

        public void SetEnabled(bool value)
        {
            _button.Enabled = value;
        }

        public void PlayerClaim(bool bot)
        {
            Filled = true;
            BotOwned = bot;
            if (bot)
            {
                _button.Text = "O";
            }
            else
            {
                _button.Text = "X";
            }
        }
    }
}