Могой тоглоомын код

class Snake:PictureBox
    {
        public int x;
        public int y;
        public int z;
        public Snake(int x,int y, int z)
        {
            this.x = x;
            this.y = y;
            this.z = z;
            Width = 10;
            Height = 10;
            Top = x * 10 + 30;
            Left = y * 10 + 30;


            switch (z)
            {
                case 1: BackColor = Color.Blue; break;
                case 2: BackColor = Color.Red; break;
                case 3: BackColor = Color.Green; break;
            }
        }
        public void move(string t)
        {
            switch(t)
            {
                case "Up": x--;break;
                case "Right":y++;break;
                case "Down":x++;break;
                case "Left":y--;break;
            }
            Top = x * 10 + 30;
            Left = y * 10 + 30;
        }


        public void change(int x, int y)
        {
            this.x = x;
            this.y = y;
            Top = x * 10 + 30;
            Left = y * 10 + 30;
        }


    }








    public partial class Form1 : Form
    {
        Snake food;
        Snake[] s=new Snake[21];
        int leng=3;
        string d="Right";
        void SnakeMove(string t)
        {
            for (int i = leng-1; i >0; i--)
            {
                s[i].change(s[i - 1].x, s[i - 1].y);
            }
            s[0].move(t);
        }


        public Form1()
        {
            InitializeComponent();
        }

        private void newToolStripMenuItem_Click(object sender, EventArgs e)
        {
            timer1.Enabled = true;
        }

        private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            d = e.KeyCode.ToString();
           
        }
        int score = 0;
        private void timer1_Tick(object sender, EventArgs e)
        {
            SnakeMove(d);
            bool ok = false;
            for (int i = 1; i < leng; i++)
            { if (s[0].x == s[i].x && s[0].y == s[i].y) ok = true; }

            if (ok)
            {
                timer1.Enabled = false;
                MessageBox.Show("Та хожигдлоо");
            }


            if (food.x == s[0].x && food.y == s[0].y)
            {

                score++;
                label1.Text = "Таны оноо: " + score.ToString();
                leng++;
                s[leng-1]=  food;
                int food_x, food_y;
                Random rd = new Random();
                food_x = rd.Next(14);
                food_y = rd.Next(14);

                food = new Snake(food_x, food_y, 1);
                food.Parent = this;
            }

            if (s[0].x >= 15) s[0].x = 0;
            if (s[0].x <= 0) s[0].x = 15;
            if (s[0].y <= 0) s[0].y = 15;
            if (s[0].y >= 15) s[0].y = 0;

           

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            for (int i = leng-1; i >=0; i--)
            {
                s[i] = new Snake(3, i+1, 1);
                s[i].Parent = this;
            }

            int food_x, food_y;

            Random rd = new Random();
            food_x = rd.Next(10);
            food_y = rd.Next(10);

            food = new Snake(food_x,food_y,1);
            food.Parent = this;
        }
    }