Button click Action to move ball tutorial example

using System;
using System.Drawing;
using System.Windows.Forms;

public class ButtonToMove : Form {
private int x = 50, y = 50;
private Button move = new Button();

public ButtonToMove() {
move.Text = "Move";
move.Location = new Point(5,5);
Controls.Add(move);
move.Click += new EventHandler(Move_Click);
}
protected void Move_Click(object sender, EventArgs e) {
x += 9;
y += 9;
Invalidate();
}
protected override void OnPaint( PaintEventArgs e ) {
Graphics g = e.Graphics;
Brush red = new SolidBrush(Color.Red);
g.FillEllipse(red ,x ,y, 20 ,20);
base.OnPaint(e);
}
public static void Main( ) {
Application.Run(new ButtonToMove());
}
}

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