Avoid Flickering in Windows Forms?

Question

Double buffering not working with combo-box. is there any another methods to avoid flickering in windows forms?

i have one windows form with number of panels in it.

Answer 1

    protected override CreateParams CreateParams
    {
        get
        {
            CreateParams handleParam = base.CreateParams;
            handleParam.ExStyle |= 0x02000000;   // WS_EX_COMPOSITED       
            return handleParam;
        }
    }