Tic Tac Toe

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

namespace TicTacToe
{
    public partial class Form1 : Form
    {
        bool turn = true;
        int turn_count = 0;

        public Form1()
        {
            InitializeComponent();
        }

        private void beendenToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button_Click(object sender, EventArgs e)
        {
            Button b = (Button)sender;
            b.Enabled = false;
            b.Text = (turn) ? "X" : "O";

            turn = !turn;
            turn_count++;

            Check_for_winner();
        }

        private void Check_for_winner()
        {
            bool win = false;

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


            if (win)
            {
                DisableButtons();
                string winner = (turn) ? "O" : "X";
                MessageBox.Show(winner + " Wins!","We have a Winner");
            }
            else
            {
                if (turn_count == 9)
                {
                    MessageBox.Show("Draw!");
                }
            }
        }

        private void neuesSpielToolStripMenuItem_Click(object sender, EventArgs e)
        {
            foreach (Control c in Controls)
            {
                try
                {
                    Button b = (Button)c;
                    b.Text = "";
                    b.Enabled = true;
                }
                catch { }
            }
            turn = true;
            turn_count = 0;
        }

        private void DisableButtons()
        {
            foreach (Control c in Controls)
            {
                try
                {
                    Button b = (Button)c;
                    b.Enabled = false;
                }
                catch { }
            }

        }

        private void button_MouseEnter(object sender, EventArgs e)
        {
            Button b = (Button)sender;
            if (b.Enabled)
                b.Text = (turn) ? "X" : "O";
        }

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

        private void buttonComputer_Click(object sender, EventArgs e)
        {

        }


    }
}