How to eliminate flicker in Windows.Forms custom control when scrolling?

Question

I want to create a custom control in C#. But every time I have to fully redraw my control, it flickers, even if I use double buffering (drawing to an Image first, and blitti

Answer 1

It may be good enough to just call

SetStyle(ControlStyles::UserPaint | ControlStyles::AllDrawingInWmPaint, true);

The flickering you are seeing most likely because Windows draws the background of the control first (via WM_ERASEBKGND), then asks your control to do whatever drawing you need to do (via WM_PAINT). By disabling the background paint and doing all painting in your OnPaint override can eliminate the problem in 99% of the cases without the need to use all the memory needed for double buffering.