Basically, I want to create a windows application in c# that will
allow users to draw lines between two user controls in a panel object.
 The line should snap to a position on the control (I'm not bothered
where).

Here's the setting:

1. Create a new c# windows application
2. On the form, place a panel object
3. Create two user controls in the project (not additional projects). 
These can be square controls with nothing else.
4. Place one of each control in the panel on the form.

Basically, we should now have a form with a panel containing two
square user controls.  The challenge is to write a piece of code that
when the user of our application clicks on one control and drags over
to the other, a line is created which snaps to the edge of each
control (like the MS Access query builder).

You cannot assume the position of the controls as the user will
eventually be able to move them.  If the user were to move a control,
the line needs to stay connected.

A solution would be greatly appreciated.

Steve