private void editPersonClick(object sender, EventArgs e)
        {
            DisableButtons();
            PersonEditForm personEditForm = new PersonEditForm(listOfPersons[listViewPerson.SelectedIndices[0]]);

            personEditForm.FormClosed += Reload_FormClosed;
            personEditForm.Show();
        }
        // create Person
        private void AddPersonButtonClick(object sender, EventArgs e)
        {
            DisableButtons();

            listPerson.Add(new Person());
            PersonEditForm personEditForm = new PersonEditForm(listPerson[listPerson.Count - 1]);

            personEditForm.FormClosed += EnableButtons_FormClosed;
            personEditForm.Show();
        }