C#

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

namespace app
{
	public partial class Form1 : Form
	{
		private System.Drawing.Bitmap myBitmap;
		Thread newThread;
		public Form1()
		{
			InitializeComponent();
			newThread = new Thread(new ThreadStart(draw));
			newThread.Start();
		}

		private void Form1_Paint(object sender, PaintEventArgs e)
		{
			Graphics graphicsObj = e.Graphics;
			graphicsObj.DrawImage(myBitmap, 0, 0, myBitmap.Width, myBitmap.Height);
		}

		private void Form1_Load(object sender, EventArgs e)
		{
			myBitmap = new Bitmap(this.ClientRectangle.Width,
				this.ClientRectangle.Height,
				System.Drawing.Imaging.PixelFormat.Format24bppRgb);
		}
		public void draw()
		{
			Graphics gfx;
			gfx = Graphics.FromImage(myBitmap);
			Pen myPen = new Pen(System.Drawing.Color.Plum, 3);
		gfxLoop:
			for (int i = 1; i < 100; i++)
			{
				myPen.Color = Color.FromArgb(0, 0 + (i * 2), 0);
				gfx.DrawEllipse(myPen, 50 + i, 50 + i, 200 - (i * 2), 200 - (i * 2));
				Thread.Sleep(20);
				this.Invalidate();
			}
			for (int j = 0; j < 100; j++)
			{
				myPen.Color = Color.FromArgb(200 - (j * 2), 0, 100 - j);
				gfx.DrawEllipse(myPen, 150 - j, 150 - j, j * 2, j * 2);
				Thread.Sleep(20);
				this.Invalidate();
			}
			goto gfxLoop;
		}

		private void Form1_FormClosing(object sender, FormClosingEventArgs e)
		{
			newThread.Abort();
		}
	}
}