public partial class GameForm : Form
    {
        const String VERSION = "v0.2";
        const String TITLE = "PacMaze " + VERSION;

        // Timer variables.
        int lastTick;
        int lastFrameRate;
        int frameRate;
        int delta;

        // Graphics variables.
        Graphics graphics;
        Graphics backBufferObject;
        Bitmap backBuffer;

        public GameForm()
        {
            InitializeComponent();
            this.Show();
            this.Focus();

            // Initialize graphics objects.
            graphics = this.CreateGraphics();
            backBuffer = new Bitmap(this.Width, this.Height);

            LoopGame();
        }

        /// <summary>
        /// Start permanent game logic loop, run game completely.
        /// </summary>
        private void LoopGame()
        {
            while (true) // Permanent loop, will run as long as game is NOT being exited.
            {
                Application.DoEvents(); // Test for running.

                // Handle user-input (Keyboard).

                // Draw things to the screen.
                DrawScreen();

                // Handle timing issues.
                DoTimer();
            }
        }


        /// <summary>
        /// Draw main graphics to the screen.
        /// </summary>
        private void DrawScreen()
        {
            // Copy the BackBuffer to Graphics Object.
            using (graphics = Graphics.FromImage(backBuffer))
            using (backBufferObject = this.CreateGraphics())
            {
                // Draw BackBuffer to screen (buffer switching).
                backBufferObject.DrawImage(backBuffer, 0, 0, this.Width, this.Height);

                graphics.DrawImage(Properties.Resources.scary_pacman, new Rectangle(
                    this.Width / 2 , this.Height / 2, 32, 32));

                graphics.Clear(Color.Thistle); // Clear BackBuffer for efficient rendering.
            }
        }

        /// <summary>
        /// Control timing with ticks per second.
        /// </summary>
        private void DoTimer()
        {
            delta = System.Environment.TickCount - lastTick;
            if (delta >= 1000)
            {
                this.Text = TITLE + "  FPS: " + lastFrameRate + " Delta: " + delta; // Display timing stats every second.
                lastFrameRate = frameRate;
                frameRate = 0;
                lastTick = System.Environment.TickCount;
            }

            frameRate++;
        }

    }