Passing Values From Modal Form To Parent Form?

I am trying to pass information to parent form from modal form in vb.net winforms application.

1.) I created a copy of a form and displayed it using following code.

dim f=new frmParent()
f.show()

2.) Depending on conditions a button on frmParent opens a modal child form and asks for some informations. I used following code for that:

dim f = new ChildForm()
f.showDialog()

Both code works fine. When user press saves in child form i need to close childForm and use the user types values in parent form. I know how to close the childform but not sure how to pass info from childform to parent form.