Ping pong c# (orientado a objetos)

Estos son los siguientes elementos que vamos a necesitar;

Código del programa;

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

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();   

        }

        int speed =10;

        int result;

        bool top, left ;

 

        private void Form1_Load(object sender, EventArgs e)

        {

            Random rand = new Random();

            pictureBox1.Location = new Point(0, rand.Next(this.Height));

            top = left = true;

            timer1.Enabled = true;

        }

        private void timer1_Tick(object sender, EventArgs e)

        {

            if (pictureBox1.Left > pictureBox2.Left) { timer1.Enabled = false; MessageBox.Show("puntos obtenidos; "+result.ToString()); result = 0; }

            if (pictureBox1.Left + pictureBox1.Width >= pictureBox2.Left &&

                pictureBox1.Left + pictureBox1.Width <= pictureBox2.Left + pictureBox2.Width

                && pictureBox1.Top + pictureBox1.Height >= pictureBox2.Top &&

                pictureBox1.Top + pictureBox1.Height <= pictureBox2.Top + pictureBox2.Height + pictureBox1.Height)

            {

                left = false;

                result += 1;

                this.Text = result.ToString();

            }

            if (left) pictureBox1.Left += speed; else pictureBox1.Left -= speed;

            if (top) pictureBox1.Top += speed; else pictureBox1.Top -= speed;

            if (pictureBox1.Top >= this.Height - 50) top = false;

            if (pictureBox1.Top <= 0) top = true;

            if (pictureBox1.Left <= 0) left = true;

        }

        private void Form1_MouseMove(object sender, MouseEventArgs e)

        {

            pictureBox2.Top = e.Y;

        }

    }

}