drowing a line

Question

hi... im just starting to use C# and its all a little new to me :) I wanna have function that takes 2 paramiters (2 points) and draw a line between them... I know that i need PEN for drawing, and points, but problem accures with "Graphics g = e.Graphics" How can i pass this "e" to my function ?? or maybe i understand all this wrong ?? :)