This is what I have done so far.

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 game.casestudy
{
    public partial class Form2 : Form
    {

        public Form2()
        {
            InitializeComponent();
        }

        private void objectiveToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Form Ronald = new Form3();
            Ronald.Show();
        }

        private void closeGameToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void newGameToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Form Ronald = new Form2();
            Ronald.Show();
            this.Close();
        }

        private void button1_Click(object sender, EventArgs e)
        {

            if (label1.Enabled == true)
            {
                button1.Text = "X";
                label1.Enabled = false;
                label2.Enabled = true;
                button1.Enabled = false;

            }
            else
            {
                button1.Text = "O";
                label1.Enabled = true;
                label2.Enabled = false;
                button1.Enabled = false;
            }
            {
            if (label1.Enabled == true)
            {
                button1.Text = "X";
                button2.Text = "X";
                button3.Text = "X";
                MessageBox.Show("Player1 wins!");
            }
            else
            {

                MessageBox.Show("Player2 wins!");
            }
        }
        }

        private void label1_Click(object sender, EventArgs e)
        {
        }
        private void button2_Click(object sender, EventArgs e)
        {


            if (label1.Enabled == true)
            {
                button2.Text = "X";
                label1.Enabled = false;
                label2.Enabled = true;
                button2.Enabled = false;
            }
            else
            {
                button2.Text = "O";
                label1.Enabled = true;
                label2.Enabled = false;
                button2.Enabled = false;
            }

        }

        private void label2_Click(object sender, EventArgs e)
        {

        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (label1.Enabled == true)
            {
                button3.Text = "X";
                label1.Enabled = false;
                label2.Enabled = true;
                button3.Enabled = false;
            }
            else
            {
                button3.Text = "O";
                label1.Enabled = true;
                label2.Enabled = false;
                button3.Enabled = false;
            }
        }

        private void button4_Click(object sender, EventArgs e)
        {
            if (label1.Enabled == true)
            {
                button4.Text = "X";
                label1.Enabled = false;
                label2.Enabled = true;
                button4.Enabled = false;

            }
            else
            {
                button4.Text = "O";
                label1.Enabled = true;
                label2.Enabled = false;
                button4.Enabled = false;
            }
        }

        private void button5_Click(object sender, EventArgs e)
        {
            if (label1.Enabled == true)
            {
                button5.Text = "X";
                label1.Enabled = false;
                label2.Enabled = true;
                button5.Enabled = false;
            }
            else
            {
                button5.Text = "O";
                label1.Enabled = true;
                label2.Enabled = false;
                button5.Enabled = false;
            }
        }

        private void button6_Click(object sender, EventArgs e)
        {
            if (label1.Enabled == true)
            {
                button6.Text = "X";
                label1.Enabled = false;
                label2.Enabled = true;
                button6.Enabled = false;
            }
            else
            {
                button6.Text = "O";
                label1.Enabled = true;
                label2.Enabled = false;
                button6.Enabled = false;
            }
        }

        private void button7_Click(object sender, EventArgs e)
        {
            if (label1.Enabled == true)
            {
                button7.Text = "X";
                label1.Enabled = false;
                label2.Enabled = true;
                button7.Enabled = false;
            }
            else
            {
                button7.Text = "O";
                label1.Enabled = true;
                label2.Enabled = false;
                button7.Enabled = false;
            }
        }

        private void button8_Click(object sender, EventArgs e)
        {
            if (label1.Enabled == true)
            {
                button8.Text = "X";
                label1.Enabled = false;
                label2.Enabled = true;
                button8.Enabled = false;
            }
            else
            {
                button8.Text = "O";
                label1.Enabled = true;
                label2.Enabled = false;
                button8.Enabled = false;
            }
        }

        private void button9_Click(object sender, EventArgs e)
        {
            if (label1.Enabled == true)
            {
                button9.Text = "X";
                label1.Enabled = false;
                label2.Enabled = true;
                button9.Enabled = false;
            }
            else
            {
                button9.Text = "O";
                label1.Enabled = true;
                label2.Enabled = false;
                button9.Enabled = false;
            }
        }

        private void Form2_Load(object sender, EventArgs e)
        {

        }
    }
}

Can you please help me in determining the winner of the game and of a game is a draw.

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