.NET Real Time Data Chart

Question

I want to make a real time data chart that shows last 10 minutes in asp.net or winForms.

This is the image that i want to make it

I added the series but could not add datapoints. I searched a lot but i failed.

I use infragistics by the way.

Below code generates random numbers and shows that number in the charts. It works but just last number that i can see it. not last 10 minutes.

    private void Form1_Load(object sender, EventArgs e)
    { 
        Timer timer = new Timer();
        timer.Interval = (1 * 1000); // 1 secs
        timer.Tick += new EventHandler(timer_Tick);
        timer.Start();
    }

    private void timer_Tick(object sender, EventArgs e)
    {
        Random r = new Random();
        int rnd=r.Next(1, 150);
        DataTable dt = new DataTable();

        dt.Columns.Add("Value", typeof(int));
        dt.Columns.Add("Date", typeof(DateTime));
        dt.Rows.Add(rnd, DateTime.ParseExact(DateTime.Now.ToLongTimeString(), "HH:mm:ss", null));

        NumericTimeSeries series = new NumericTimeSeries();      
        series.DataBind(dt, "Date", "Value");
        NumericTimeDataPoint ndp1 = new NumericTimeDataPoint(DateTime.Now, rnd, "ilk", false);
        NumericTimeDataPoint ndp2 = new NumericTimeDataPoint(DateTime.Now, 5.0, "iki", false);
        series.Points.Add(ndp1);
        series.Points.Add(ndp2);
        ultraChart2.Data.SwapRowsAndColumns = true;
        ultraChart2.DataSource = dt;
    }

Answer 1

If I understand your problem correctly,

On each tick, you are replacing your data instead of adding to it.

Try initializing the series once in the Form1_Load handler, and on each tick, just add new values to it, without creating a new DataTable, rebinding it to the series and so on.

---

To make things clear,

Your timer_Tick handler should have only 4 lines of code:

private void timer_Tick(object sender, EventArgs e)
{
    NumericTimeDataPoint ndp1 = new NumericTimeDataPoint(DateTime.Now, rnd, "ilk", false);
    NumericTimeDataPoint ndp2 = new NumericTimeDataPoint(DateTime.Now, 5.0, "iki", false);
    _series.Points.Add(ndp1);
    _series.Points.Add(ndp2);
}

Declare the _series as a private member, initialize it from the Form1_Load handler, and you should be good to go.