using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace Air_Hockey
{
    public partial class frmAirHockey : Form
    {
        private Bitmap m_bmpDrawSurface;
        private Graphics m_objGraphics;
        private SolidBrush m_objSolidBrush = new SolidBrush(Color.Black);
        private int m_intMouseX;
        private int m_intMouseY;

        public frmAirHockey()
        {
            InitializeComponent();
            
            //Create a Bitmap in Memory
            m_bmpDrawSurface = new Bitmap(this.ClientRectangle.Width,
                this.ClientRectangle.Height);
        }

        private void Render()
        {
            //Draw to a bitmap in memory
            m_objGraphics = Graphics.FromImage(m_bmpDrawSurface);
            m_objGraphics.Clear(Color.Aqua);
            m_objGraphics.FillEllipse(m_objSolidBrush,
                m_intMouseX-25, m_intMouseY-25, 50, 50);
            m_objGraphics.Dispose();
        }
        
        private void frmAirHockey_MouseMove(object sender, MouseEventArgs e)
        {
            //Mouse X and Y coidinates for drawing the ellipse
            m_intMouseX = e.X;
            m_intMouseY = e.Y;
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            //Draw to the forms surface
            e.Graphics.DrawImage(m_bmpDrawSurface, 0, 0);
            e.Graphics.Dispose();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            //Draw to the memory and force the form to be repainted every 10 milliseconds
            Render();
            this.Invalidate();
        }
    }
}

using System;using Drawing = System.Drawing;using Forms = System.Windows.Forms;using Threading = System.Threading;namespace GdiTest{	public static class Application	{				private static Drawing.BufferedGraphics BufferedGraphics = null;				private static Drawing.BufferedGraphicsContext BufferedGraphicsContext = new Drawing.BufferedGraphicsContext();				private static Forms.Form Form = new Forms.Form();				private static int FPS = 0;				private static string Title = "GDI Test";				private static Forms.Timer UpdateTimer = new Forms.Timer();				static Application()		{			Form.Text = Title;			Form.ClientSize = new Drawing.Size( 640, 480 );			Form.Resize += new EventHandler( FormResizeEvent );			BufferedGraphics = BufferedGraphicsContext.Allocate( Drawing.Graphics.FromHwnd( Form.Handle ), Form.ClientRectangle );			UpdateTimer.Interval = 1000;			UpdateTimer.Tick += new EventHandler( UpdateTimerTickEvent );			UpdateTimer.Start();			return;		}				private static void FormResizeEvent( object Sender, EventArgs Arguments )		{			BufferedGraphics.Dispose();			BufferedGraphics = BufferedGraphicsContext.Allocate( Drawing.Graphics.FromHwnd( Form.Handle ), Form.ClientRectangle );			return;		}				private static void Render()		{			BufferedGraphics.Render();			FPS++;			return;		}				private static void UpdateTimerTickEvent( object Sender, EventArgs Arguments )		{			Form.Text = Title + " - " + FPS.ToString() + " FPS";					FPS = 0;			return;		}				[STAThread]		public static void Main( string[] ArgumentArray )		{			Forms.Application.EnableVisualStyles();			Form.Show();			while( Form.Created )			{				if( ( Form.Visible == false ) || ( Form.ContainsFocus == false ) || ( Form.Enabled == false ) )				{					Threading.Thread.Sleep( 100 );				}				else				{					Render();				}				Forms.Application.DoEvents();			}			BufferedGraphics.Dispose();			BufferedGraphicsContext.Dispose();			return;		}			}	}