Steema Central

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 public Form1()
        {
            InitializeComponent();
            InitializeChart();
        }
        Steema.TeeChart.Styles.Points Series1;
        Steema.TeeChart.Tools.DrawLine drawLine1;
        private void InitializeChart()
        {
            tChart1.Aspect.View3D = false;
            Series1 = new Points(tChart1.Chart);
            drawLine1 = new DrawLine(tChart1.Chart);
            Random rnd = new Random();
            DateTime dt = DateTime.Today;
            Series1.XValues.DateTime = true;
            for (int i = 0; i < 10; i  )
            {
                Series1.Add(dt, rnd.Next(100));
                dt = dt.AddHours(2); 
            }
            tChart1.Axes.Bottom.Labels.DateTimeFormat = "hh:mm";
			/* set the "X" line positions (start and end position) */
			Steema.TeeChart.Tools.DrawLineItem I = new Steema.TeeChart.Tools.DrawLineItem(drawLine1);
           /* set the "Y" line positions (start and end position) */
            tChart1.Draw();
			double tmp = Series1.YValues.Range/5.0;
            double x = Series1.ScreenPointToValuePoint(Series1.CalcXPos(2), Series1.CalcYPos(2)).X;
            double x1 = Series1.ScreenPointToValuePoint(Series1.CalcXPos(4), Series1.CalcYPos(4)).X;
            I.StartPos = new Steema.TeeChart.Drawing.PointDouble(x,Series1.YValues[2]);
            I.EndPos = new Steema.TeeChart.Drawing.PointDouble(x1,Series1.YValues[4]);
            drawLine1.EnableDraw = false;
			drawLine1.Pen.Color = Color.Blue;
            drawLine1.Pen.Width = 4;
		}