How can a Form window return a parameter ?

[JNic]

I have my main form, and I would like to add a button that open a form with option. I want the value that are changed to update the one on the main form.

What is the best or a good approach to do this ? (delegate, properties, etc... ?)

If someone can point me to a good article about this or something. Cause I did a search on the website and on the forum and couldn't come up with something.

Thank You