l13 ox basic

public partial class Form1 : Form
    {

        bool whosTurn = true; //true - X, false - O


        public Form1()
        {
            InitializeComponent();
            lblWhosTorn.Text = "X";
        }

        private void InsertSymbol(object button)
        {
            Button pressedButton = (Button)button;

            if (whosTurn)
            {
                pressedButton.Text = "X";
            }
            else
            {
                pressedButton.Text = "O";
            }

            pressedButton.Enabled = false;

            bool wynik = checkIfSomeoneWon();


            if (wynik == true)
            {
                string winText;
                if (whosTurn == true)
                {
                    winText = "Player X won! Replay?";
                }
                else

                {

                    winText = "Player 0 won! Replay?";
                }

                //We check if players want to replay the match.
                DialogResult answer = MessageBox.Show(winText, "Win", MessageBoxButtons.YesNo);





                if (answer == DialogResult.Yes)
                {
                    TurnOnAllButtonsAndReset();
                    return;
                }
                else
                {
                    Close();
                }



            whosTurn = !whosTurn; //player switch
            if (whosTurn == true)
            {
                lblWhosTorn.Text = "X";
            }
            else
            {
                lblWhosTorn.Text = "O";
            }

        }

        private void TurnOnAllButtonsAndReset()
        {


            btn1.Enabled = true;
            btn2.Enabled = true;
            btn3.Enabled = true;
            btn4.Enabled = true;
            btn5.Enabled = true;
            btn6.Enabled = true;
            btn7.Enabled = true;
            btn8.Enabled = true;
            btn9.Enabled = true;
            btn1.Text = "";
            btn2.Text = "";
            btn3.Text = "";
            btn4.Text = "";
            btn5.Text = "";
            btn6.Text = "";
            btn7.Text = "";
            btn8.Text = "";
            btn9.Text = "";
            whosTurn = true;
            lblWhosTorn.Text = "X";
        }


        private bool checkIfSomeoneWon()
        {

            if (btn1.Text == btn2.Text && btn2.Text == btn3.Text && btn1.Text != "")

            {
                return true;
            }

            else if (btn4.Text == btn5.Text && btn5.Text == btn6.Text && btn4.Text != "")
            {
                return true;
            }

            else if (btn7.Text == btn8.Text && btn8.Text == btn9.Text && btn7.Text != "")
            {
                return true;
            }

            else if (btn1.Text == btn4.Text && btn4.Text == btn7.Text && btn1.Text != "")
            {
                return true;
            }

            else if (btn2.Text == btn5.Text && btn5.Text == btn8.Text && btn2.Text != "")
            {
                return true;
            }

            else if (btn3.Text == btn6.Text && btn6.Text == btn9.Text && btn3.Text != "")
            {
                return true;
            }
            else if (btn1.Text == btn5.Text && btn5.Text == btn9.Text && btn1.Text != "")
            {
                return true;
            }

            else if (btn3.Text == btn5.Text && btn5.Text == btn7.Text && btn3.Text != "")
            {
                return true;
            }
            else
            {
                return false;
            }
        }

        private void btn_click(object sender, EventArgs e)
        {
            InsertSymbol(sender);
        }
    }