How do you write a class using the following program?

Question

I am writing a simple game with the following characteristics:
1:When I click on the form,made a ball and Move to this side and that side.
2:When the click again,Repeat the above procedure .
3:when Two of the balls collide they,Both are removed.

* I wrote the first part of the code
* Please help me to write the rest of it?

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 WindowsFormsApplication46

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        public Boolean top = true;

        public Boolean left = true;

        public int Speed =5;

        private void timer1_Tick(object sender, EventArgs e)

        {

            try

            {

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

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

             

                if (pictureBox1.Top >= this.Height-100) top = false;

                if (pictureBox1.Left >= this.Width-100) left = false;

 

 

                if (pictureBox1.Top < -5) top = true;

                if (pictureBox1.Left < -5) left = true;

            }

            catch

            {

                timer1.Enabled = false;

            }

        }

private void Form1_Click(object sender, EventArgs e)

        {

            timer1.Enabled = true;

        }

    }

}