private void OnEdit(object sender, EventArgs e)
        {
            var item = GetSelectedContact();

            if (item == null)
            {
                return;
            }

            var form = new ContactForm
            {
                Text    = "Edit Contact",
                Contact = item
            };

            if (form.ShowDialog(this) == DialogResult.Cancel)
            {
                return;
            }

            _contactDatabase.Edit(item.Name, form.Contact);
            RefreshContacts();
        }