public void Paint(Graphics g)
{
createLine();
Pen pen = new Pen(Color.Red, 1);
using( pen )
{
System.Drawing.Drawing2D.AdjustableArrowCap bigArrow = new System.Drawing.Drawing2D.AdjustableArrowCap(5, 5);
pen.CustomEndCap = bigArrow;
g.DrawLine(pen, origin, destination);
}
}