tic_tac_toe/Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Text;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp8
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        bool turn = true;
        int turn_count;
        static string player1, player2;
        bool pc = false;

        public static void setName(String n1, String n2)
        {
            player1= n1;
            player2= n2;
        }

        private void A1_MouseEnter(object sender, EventArgs e)
        {
            Button b = (Button)sender;
            if (turn)
            {
                b.Text = "X";
            }
            else
            {
                b.Text = "O";
            }
        }

        private void A1_MouseLeave(object sender, EventArgs e)
        {
            Button b = (Button)sender;
            if (b.Enabled == true)
            b.Text = "";
        }

        private void A1_Click(object sender, EventArgs e)
        {
            Button b = (Button)sender;
            turn_count++;
            if (turn)
            {
                b.Text = "X";
                b.Enabled = false;
                turn = false;
                Winner();
            }
            else
            {
                b.Text = "O";
                b.Enabled = false;
                turn = true;
                Winner();
            }
        }

        private void Enabled_b()
        {
            Button b = null;
            foreach (Control c in Controls)
            {
                b = c as Button;
                if (b != null)
                {
                    b.Enabled = true;
                    b.Text = "";
                }
            }
        }

        private void Disable_b()
        {
            foreach (Control c in Controls)
            {
                if (c is Button b && b.Enabled)
                {
                    b.Enabled = false;
                }
            }
        }

        private void Winner()
        {
            bool win = false;

            if (A1.Text == A2.Text && A2.Text == A3.Text && A1.Enabled == false)
            {
                win= true;
            }
            if (B1.Text == B2.Text && B2.Text == B3.Text && B1.Enabled == false)
            {
                win = true;
            }
            if (C1.Text == C2.Text && C2.Text == C3.Text && C1.Enabled == false)
            {
                win = true;
            }

            if (A1.Text == B1.Text && B1.Text == C1.Text && A1.Enabled == false)
            {
                win = true;
            }
            if (A2.Text == B2.Text && B2.Text == C2.Text && A2.Enabled == false)
            {
                win = true;
            }
            if (A3.Text == B3.Text && B3.Text == C3.Text && A3.Enabled == false)
            {
                win = true;
            }

            if (A1.Text == B2.Text && B2.Text == C3.Text && A1.Enabled == false)
            {
                win = true;
            }
            if (A3.Text == B2.Text && B2.Text == C1.Text && A3.Enabled == false)
            {
                win = true;
            }

            if (win == true)
            {
                if (turn == false)
                {
                    label4.Text = (int.Parse(label4.Text)+1).ToString();
                    MessageBox.Show("Победил Х");
                    Enabled_b();

                    turn_count = 0;
                    turn = true;
                }
                else
                {
                    label6.Text = (int.Parse(label6.Text) + 1).ToString();
                    MessageBox.Show("Победил O");
                    Enabled_b();

                    turn_count = 0;
                    turn = true;
                }
            }
            if (!win && turn_count == 9)
            {
                label5.Text = (int.Parse(label5.Text) + 1).ToString();
                MessageBox.Show("Ничья");
                Enabled_b();

                turn_count = 0;
                turn = true;
            }
        }

        private void новаяИграToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Enabled_b();

            turn_count = 0;
            turn = true;
            label4.Text = "0";
            label5.Text = "0";
            label6.Text = "0";
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Form2 f2 = new Form2();
            f2.ShowDialog();
            label1.Text = player1 + ":";
            label2.Text = player2 + ":";
            if (player2 == "PC")
            {
                pc = true;
            }
        }

        private void изменитьИгроковToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Form2 f2 = new Form2();
            f2.ShowDialog();
            label1.Text = player1;
            label2.Text = player2;
            сброситьОчкиToolStripMenuItem.PerformClick();
            новаяИграToolStripMenuItem.PerformClick();
            this.Show();
        }

        private void сброситьОчкиToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Enabled_b();

            turn_count = 0;
            turn = true;
            label4.Text = "0";
            label5.Text = "0";
            label6.Text = "0";
        }
    }
}