How do I catch all WM_PAINT message from all control

Hi Experts,

I got stuck when trying implementing a method to catch WM_PAINT message from all control. When I run my apps, the UI seems freeze.
Does anything wrong with my code ?

public partial class frmMain : Form
{
        CustomFilter c = new CustomFilter();
 
        #region Form Method
        public frmMain()
        {
            InitializeComponent();
        }
        private void frmMain_Load(object sender, EventArgs e)
        {
            Application.AddMessageFilter(c);          
 
            c.Redraw += new AllControlRedraw(RedrawLine);
        }
 
        void RedrawLine()
        {
            IntPtr handle = Win32Helper.GetDesktopWindow();
            IntPtr hDc = Win32Helper.GetWindowDC(handle);
 
            Graphics g = Graphics.FromHdc(hDc);
            Pen p = new Pen(Color.Red, 2);
 
            Point[] StartLine = new Point[] { new Point(40, 10) };
            Point[] EndLine = new Point[] { new Point(40, 200) };
 
            for (int i = 0; i < StartLine.Length; i++)
                g.DrawLine(p, this.PointToScreen(StartLine[i]), this.PointToScreen(EndLine[i]));
 
            g.Dispose();
            Win32Helper.ReleaseDC(handle, hDc);
        }
}
 
    public delegate void AllControlRedraw(object sender, System.EventArgs e);
 
    class CustomFilter : System.Windows.Forms.IMessageFilter
    {
        private const int WM_PAINT = 0x000F;
        public event AllControlRedraw Redraw;
 
        #region IMessageFilter Members
 
        public bool PreFilterMessage(ref System.Windows.Forms.Message m)
        {
            AllControlRedraw t = Redraw;
            if (t != null)
            {
                switch (m.Msg)
                {
                    case WM_PAINT:
                        t(this, new EventArgs());
                        break;
                }
            }
 
            return true;
        }
 
        #endregion
 
        
    }

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