WinForms; detecting form closed from another form

Question

Is it possible to detect a form closing from another form. For example. If I had a mainForm that opens subForm, can I detect within the mainForm that the subForm has closed and execute code?

I understand I could create an event handler within the subForm, but this is not really what I'm after because what I'm about to do after the subForm closes, is within the mainForm (changes to mainForm).

Answer 1

The FormClosed event is public, so you can create a handler from the main form.

//Inside main Form.  Click button to open new form
private void button1_Click(object sender, EventArgs e)
{
      Form2 f2 = new Form2();
      f2.FormClosed += F2_FormClosed;
      f2.Show();
}

private void F2_FormClosed(object sender, FormClosedEventArgs e)
{
    MessageBox.Show("Form was closed");
}