WinForm resolves frequent refresh of black screen

   public  structure ()
        {
            InitializeComponent();
            SetStyle(ControlStyles.UserPaint, true);
            SetStyle(ControlStyles.AllPaintingInWmPaint, true); //  Do not erase background .
            SetStyle(ControlStyles.DoubleBuffer, true); //  Double buffering 
        }

protected override CreateParams CreateParams { get { CreateParams cp = base.CreateParams; cp.ExStyle |= 0x02000000; return cp; } }