ControlStyles.OptimizedDoubleBuffer increases my flicker problems

[poppabaggins]

I'm new to form programming in C#. Just for learning purposes, I tried double buffering to get rid of my flicker problems with a simple test program. The problem is, that enabling double buffering made increased my flicker exponentially. What should I do to solve this? Here's the code for reference

public partial class DoubleBufferPractice : Form
    {
        Timer timer;
        Rectangle rect;

        public DoubleBufferPractice()
        {
            InitializeComponent();
            this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
            this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
            this.SetStyle(ControlStyles.UserPaint, true);
            rect = new Rectangle(0, this.Height/3, 50, 50);
            InitializeTimer();
        }

        private void InitializeTimer()
        {
            timer = new Timer();
            timer.Interval = 10;
            timer.Tick += new EventHandler(timer_Tick);
            timer.Start();
        }

        private void timer_Tick(object sender, EventArgs e) 
        {
            if(rect.X + rect.Width < this.Width)
                rect.X += 10;
            else
                rect.X = 0;
            this.Invalidate();
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            using(Graphics g = this.CreateGraphics()) {
                using(Brush brush = new SolidBrush(Color.Magenta)) {
                    g.FillRectangle(brush, rect);
                }
            }
            base.OnPaint(e);
        }
    }

Also, I'm testing this on my laptop with a 2.0ghz Dual Core Pentium, 2gigs ram, and a 256meg nonshared vram NVidia Geforce 8600 M GT, so I don't think that hardware is the problem.

[mmikey7]

Hi, first of all, do NOT you this.CreateGraphics(). Just use e.Graphics available from parameter like this: protected override void OnPaint(PaintEventArgs e) { //using(Graphics g = this.CreateGraphics()) //{ using(Brush brush = new SolidBrush(Color.Magenta)) { e.Graphics.FillRectangle(brush, rect); } //} base.OnPaint(e); } second of all, interval is in miliseconds so this timer.Interval = 10; will redraw whole form 100 times per second. It may flicker even on good computer. hth

[poppabaggins]

Thank you so much. changing it to e.Graphics fixed everything. Also, it went from extreme flicker (practically disappearing for a full second or two) to incredibly minor flicker at a 10ms interval.