private void editButton_Click(object sender, EventArgs e)
{
if (peopleListBox.SelectedItem is Person person)
{
var editForm = new AddForm(person);
var result = editForm.ShowDialog();
if (result == DialogResult.OK)
{
var index = peopleListBox.SelectedIndex;
people.RemoveAt(index);
people.Insert(index, editForm.Person);
peopleListBox.Items.RemoveAt(index);
peopleListBox.Items.Insert(index, editForm.Person);
}
}
}