PaintBrush in .Net

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

namespace GetPixelExample
{
    public class Form1 : Form
    {
        private class ImageControl : Panel
        {
            private Bitmap bitmap = new Bitmap("C:\\alien.jpg");

            public ImageControl()
            {
                MouseMove += new MouseEventHandler(HandleMouseMove);
            }

            private void HandleMouseMove(object sender, MouseEventArgs e)
            {
                // Scale the window coordinates to the bitmap coordinates
                double windowX = e.X;
                double windowY = e.Y;

                double controlWidth = Width;
                double controlHeight = Height;
                double imageWidth = bitmap.Width;
                double imageHeight = bitmap.Height;

                // Color of pixel under cursor grabbed here
                Color pixel = bitmap.GetPixel(
                   (int)(windowX * bitmap.Width / controlWidth),
                   (int)(windowY * bitmap.Height / controlHeight));
                System.Diagnostics.Debug.WriteLine(pixel);
            }

            protected override void OnResize(EventArgs eventargs)
            {
                base.OnResize(eventargs);
                Invalidate();
            }

            protected override void  OnPaintBackground(PaintEventArgs pevent)
            {
                 pevent.Graphics.DrawImage(bitmap, Bounds);
            }
        }

        public Form1()
        {
            ImageControl control = new ImageControl();
            control.Dock = DockStyle.Fill;
            Controls.Add(control);
            this.PerformLayout();
        }

        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}