Advanced Guide to WPF ScrollBar or How to Display Millions of Colour Combinations

If you write your own WPF control and its content is big, you need to implement scrolling and zooming. Normally, it is quite convenient to use ScrollViewer for this, but when the content is truly big, it is more efficient to use ScrollBar and write the selected content directly to the screen by overwriting the control's OnRender(). When I started using ScrollBar, I struggled for weeks to get it right. In this article, I like to share some best practices so that you can get your ScrollBar up and running perfectly in no time.