private async void startBtn_Click(object sender, EventArgs e) { IPAddress iPAddress; if (ipAddressInput.Text.Trim() == String.Empty || !IPAddress.TryParse(ipAddressInput.Text, out iPAddress)) { MessageBox.Show("Please enter valid ip4 address"); return; } _server = new ServerInstance(ipAddressInput.Text); startBtn.Enabled = false; stopBtn.Enabled = true; try { statusLabel.Text = "Started listenning"; await _server.StartListeningAsync(_notifyIcon); } catch (Exception ex) { MessageBox.Show(ex.Message); } }