Tic Tac Toe implemented in C#

// -- If all buttons have the same handling, I do it this way.
// -- However, if not all buttons on the form have the same handling, I set a value for each button's "Tag" property.
// --
// -- You could set each TTT button's Tag to its number (1-9)

// Rather than creating the event handler with the designer, I do this:

private void Form1_Load(object sender, EventArgs e)
{
    // Iterate child controls and set the Click event handler for each 
    foreach (Control child in this.Controls)
    {
        if (child is Button) // With a Tag on certain buttons, I also add "&& child.Tag == *YOUR_TAG_HERE*"
            child.Click += new EventHandler(boardButton_Click);
    }
}
 
void boardButton_Click(object sender, EventArgs e)
{
    Button from = (Button)sender;    // This is the button that was clicked
    switch (from.Tag)
    {
        case "Grid_1":
            break;
        // More button IDs (Tag)...
        case "Grid_9":
            break;
    }
}

/*
 * Created by SharpDevelop.
 * User: Reasearch Engineer
 * Date: 7/23/2010
 * Time: 6:50 PM
 * 
 * To change this template use Tools | Options | Coding | Edit Standard Headers.
 */
using System;
using System.Windows.Forms;
 
namespace ticktacktoe
{
    /// 

    /// Description of MainForm.
    /// 
    public partial class MainForm : Form
    {
        public MainForm()
        {
            //
            // The InitializeComponent() call is required for Windows Forms designer support.
            //
            InitializeComponent();
            reset();
            //
            // TODO: Add constructor code after the InitializeComponent() call.
            //
            button1.Click += new EventHandler(Button_Clicked);
            button2.Click += new EventHandler(Button_Clicked);
            button3.Click += new EventHandler(Button_Clicked);
            button4.Click += new EventHandler(Button_Clicked);
            button5.Click += new EventHandler(Button_Clicked);
            button6.Click += new EventHandler(Button_Clicked);
            button7.Click += new EventHandler(Button_Clicked);
            button8.Click += new EventHandler(Button_Clicked);
            button9.Click += new EventHandler(Button_Clicked);
        }
 
        void Button_Clicked(object sender, EventArgs e)
        {
            Button btn = (Button)sender;
 
            if (int.Parse(btn.Tag.ToString()) == 8)
            {
                btn.Text = let.ToString();
                btn.Tag = val;
                flip();
                chekwin(int.Parse(btn.Tag.ToString()));
            }
        }
 
        char let = 'X';
        int val = 1, cnt = 0;
 
        // Method to reset the game to beginning.
        void reset()
        {
            let = 'X';
            val = 1;
            cnt = 0;
 
            foreach (Control ctrl in this.Controls)
            {
                if (ctrl is Button)
                {
                    ctrl.Text = "";
                    ctrl.Tag = 8;
                }
            }
        }
 
        // Method to check the win.
        void chekwin(int no)
        {
            if (cnt > 4)
            {
                if (no == 1)
                {
                    if ((int.Parse(button1.Tag.ToString()) + int.Parse(button2.Tag.ToString()) + int.Parse(button3.Tag.ToString())) == 3 ||
                        (int.Parse(button1.Tag.ToString()) + int.Parse(button4.Tag.ToString()) + int.Parse(button7.Tag.ToString())) == 3 ||
                        (int.Parse(button9.Tag.ToString()) + int.Parse(button8.Tag.ToString()) + int.Parse(button7.Tag.ToString())) == 3 ||
                        (int.Parse(button3.Tag.ToString()) + int.Parse(button6.Tag.ToString()) + int.Parse(button9.Tag.ToString())) == 3 ||
                        (int.Parse(button1.Tag.ToString()) + int.Parse(button5.Tag.ToString()) + int.Parse(button9.Tag.ToString())) == 3 ||
                        (int.Parse(button3.Tag.ToString()) + int.Parse(button5.Tag.ToString()) + int.Parse(button7.Tag.ToString())) == 3 ||
                        (int.Parse(button2.Tag.ToString()) + int.Parse(button5.Tag.ToString()) + int.Parse(button8.Tag.ToString())) == 3 ||
                        (int.Parse(button4.Tag.ToString()) + int.Parse(button5.Tag.ToString()) + int.Parse(button6.Tag.ToString())) == 3)
                    {
                        MessageBox.Show("Player 1(Playing X) Wins!");
                        reset();
                    }
                }
                else
                {
                    if ((int.Parse(button1.Tag.ToString()) + int.Parse(button2.Tag.ToString()) + int.Parse(button3.Tag.ToString())) == 6 ||
                        (int.Parse(button1.Tag.ToString()) + int.Parse(button6.Tag.ToString()) + int.Parse(button7.Tag.ToString())) == 6 ||
                        (int.Parse(button9.Tag.ToString()) + int.Parse(button8.Tag.ToString()) + int.Parse(button7.Tag.ToString())) == 6 ||
                        (int.Parse(button3.Tag.ToString()) + int.Parse(button4.Tag.ToString()) + int.Parse(button9.Tag.ToString())) == 6 ||
                        (int.Parse(button1.Tag.ToString()) + int.Parse(button5.Tag.ToString()) + int.Parse(button9.Tag.ToString())) == 6 ||
                        (int.Parse(button3.Tag.ToString()) + int.Parse(button5.Tag.ToString()) + int.Parse(button7.Tag.ToString())) == 6 ||
                        (int.Parse(button2.Tag.ToString()) + int.Parse(button5.Tag.ToString()) + int.Parse(button8.Tag.ToString())) == 6 ||
                        (int.Parse(button6.Tag.ToString()) + int.Parse(button5.Tag.ToString()) + int.Parse(button4.Tag.ToString())) == 6)
                    {
                        MessageBox.Show("Player 2(Playing O) Wins!");
                        reset();
                    }
                }
            }
 
            if (cnt == 9)
            {
                MessageBox.Show("The game is a Draw!");
                reset();
            }
        }
 

        //Method to swich between Characters(X&O) after a move.
        void flip()
        {
            if (let == 'X')
            {
                let = 'O';
                val = 2;
                cnt++;
            }
            else
            {
                let = 'X';
                val = 1;
                cnt++;
            }
        }
 
        void NewGameToolStripMenuItemClick(object sender, EventArgs e)
        {
            reset();
        }
 
        void ExitToolStripMenuItemClick(object sender, EventArgs e)
        {
            Application.Exit();
        }
 
        void HowToPlayToolStripMenuItemClick(object sender, EventArgs e)
        {
            MessageBox.Show("This is a simple game in which win is declared \nwhen a player occupies boxes arranged adjecent \nin row, column or adiagonal before the other \nplayer does the same.");
        }
 
        void AboutToolStripMenuItemClick(object sender, EventArgs e)
        {
            MessageBox.Show("Author : Tejas Pathak\nGoa - India\nEmail-devtejaspathak@gmail.com");
        }
    }
}