C#

<br />
        public Form1()<br />
        {<br />
            InitializeComponent();<br />
        }<br />
<br />
        private void Form1_Load(object sender, EventArgs e)<br />
        {<br />
            // create a dataset and populate it with data<br />
            UnitDataSet uds = new UnitDataSet();<br />
            uds.DIns.ReadXml("Data.xml");<br />
<br />
            // create a new comms instance and pass a ref to the dataset<br />
            _comms = new Comms(uds);<br />
<br />
            // create a label to bind too<br />
            Label lblInputState = new Label();<br />
            panel1.Controls.Add(lblInputState);<br />
<br />
            // databind the control to the state column<br />
            lblInputState.DataBindings.Add("Text", uds.Tables["DIns"], "state");<br />
        }<br />
<br />
        // used to test if the binding works and value changes as expected<br />
        public void button1_Click(object sender, EventArgs e)<br />
        {<br />
            _comms.ChangeValue();<br />
        }<br />
    }<br />
<br />
============================================================<br />
<br />
class Comms<br />
    {<br />
        SerialPort _sp;<br />
        UnitDataSet _uds;<br />
<br />
        public Comms(UnitDataSet uds)<br />
        {<br />
            _uds = uds;<br />
            _sp = new SerialPort("COM7", 9600, Parity.None, 8, StopBits.One);<br />
            _sp.DataReceived += new SerialDataReceivedEventHandler(_sp_DataReceived);<br />
            _sp.Open();<br />
        }<br />
<br />
        private void _sp_DataReceived(object sender, SerialDataReceivedEventArgs e)<br />
        {<br />
            // run this method when the event fires<br />
            ChangeValue();<br />
        }<br />
<br />
        // if i call this from the main form button (see above ) the value changes but if it's called<br />
        // by the above DataReceived event the value doesn't change!?!<br />
        public void ChangeValue()<br />
        {<br />
            // simple toggle to change the value<br />
            bool tmp = (bool)_uds.Tables["DIns"].Rows[0]["state"];<br />
            _uds.Tables["DIns"].Rows[0]["state"] = !tmp;<br />
        }<br />
    }<br />