Get scroll Position Percentage

I need to be able to determine when the user has scrolled through 60% of t开发者_运维技巧he content in a panel and I'm not having much luck finding a solution for this.

Thanks in advance for any ideas.

On Panel's Scroll Event, you can do

double scrollPercentage = (double) 
                scrollbar.VerticalScroll.Value / scrollBar.VerticalScroll.Maximum;

if (scrollPercentage > 0.6)
{
    ...
}