private void but_Check_Click(object sender, EventArgs e) { //chkPort(); var reader = new SerialReader(cmbo_Ports.Text); string message; reader.OpenPort(); message = reader.PortIsOpen ? $"Port {reader.PortName} has been opened" : $"Port {reader.PortName} could not be opened"; //reader.ClosePort(); MessageBox.Show(message); }