private void _add_Click(object sender, EventArgs e) { var local = SystemInformation.ComputerName; var inviter = new Inviter(clients); if (inviter.ShowDialog() == DialogResult.OK) { foreach (var host in inviter.localhosts) { if (host == local) { continue; } if (clients.All((x) => x.Name != host)) { AddHost(host); } } config.Validate(); config.SaveHosts(); } }