Closing one form from another form?

Question

I have a small application that generates warnings every time the database changes. I have several options in the form of an alert that appears.
One of the options opens another form (child form), asking the user for additional information.

When the child form receives the necessary information from the user, I want it to be closed, as well as the parent form. So far, I only know how to close a child form, but not a parent form.

Parent form > Opens child form
Child gathers information > User clicks ok in child > child closes, parent closes

^ that's what i want

I simply do not have the brain power to think about how to communicate through forms in order to complete the closure of the parent form.

Any help would be greatly appreciated. Actually, that would be very appreciated. If I could learn how to make my forms communicate with each other, I could do a lot of damage (in a good sense, 8D).

Answer 1

Try this in parent form:

using (var childForm = new ChildForm())
{
    if (childForm.ShowDialog() == DialogResult.OK)
    {
        Close();
    }
}

Your child form should return DialogResult by clicking the buttons (OK or Cancel) and / or setting the AcceptButton and CancelButton properties in the constructor.

Answer 2

In the parent form, you can do something like this:

ChildForm f = new ChildForm();
f.FormClosed += (o,e) => this.Close();
f.Show();