VS 2008 Draw a line in a picture box

Hi,

I am trying to draw a line within a picture box between 2 check boxes. I have the coordinates of the start and end points of the line. When I use the drawLine method and the coordinates I have, the line is drawn far from where it should be. I think I need to get the coordinates of the check boxes relative to the window(form) but I am not sure how

Thanks