Hi Alex,

Yes that's possible - you can use the HitTest method that allows you to check the chart element below the mouse. For example:

  private void Form1_Load(object sender, EventArgs e)
  {
   NChart chart = nChartControl1.Charts[0];

   NBarSeries bar = new NBarSeries();

   bar.Values.Add(10);
   bar.Values.Add(20);
   bar.Values.Add(30);

   chart.Series.Add(bar);

   nChartControl1.MouseDown += new MouseEventHandler(nChartControl1_MouseDown);
  }

  void nChartControl1_MouseDown(object sender, MouseEventArgs e)
  {
   NHitTestResult result = nChartControl1.HitTest(e.X, e.Y);

   if (result.ChartElement == ChartElement.DataPoint)
   {
    MessageBox.Show("You clicked on bar index [" + result.DataPointIndex + "]");
   }
  }

Hit testing works for all series, chart elements.

Let us know if you meet any probelms.

Hi Alex,

Yes - in this case you need to modify the FillStyles/BorderStyles collection of the bar series. Check this code:

  private void Form1_Load(object sender, EventArgs e)
  {
   NChart chart = nChartControl1.Charts[0];

   NBarSeries bar = new NBarSeries();

   bar.Values.Add(10);
   bar.Values.Add(20);
   bar.Values.Add(30);

   chart.Series.Add(bar);

   nChartControl1.MouseDown += new MouseEventHandler(nChartControl1_MouseDown);
  }

  void nChartControl1_MouseDown(object sender, MouseEventArgs e)
  {
   NHitTestResult result = nChartControl1.HitTest(e.X, e.Y);

   if (result.ChartElement == ChartElement.DataPoint)
   {
    NBarSeries bar = result.Series as NBarSeries;

    bar.FillStyles.Clear();
    bar.BorderStyles.Clear();

    bar.FillStyles[result.DataPointIndex] = new NColorFillStyle(Color.Red);
    bar.BorderStyles[result.DataPointIndex] = new NStrokeStyle(2, Color.Orange);

    nChartControl1.Refresh();
   }
  }

It will dynamically highlight the clicked bar...