Hi Manal,
You can achieve that by intercepting the EndDrag event - the following code shows how to do that:

  private void Form1_Load(object sender, EventArgs e)
  {
   NCartesianChart chart = (NCartesianChart)nChartControl1.Charts[0];
   chart.RangeSelections.Add(new NRangeSelection());

   NBarSeries bar = new NBarSeries();

   bar.Values.Add(10);
   bar.Values.Add(20);
   bar.Values.Add(30);
   bar.Values.Add(40);

   chart.Series.Add(bar);

   nChartControl1.Controller.Tools.Add(new NPanelSelectorTool());

   NDataZoomTool dataZoomTool = new NDataZoomTool();
   dataZoomTool.EndDrag += DataZoomTool_EndDrag;
   nChartControl1.Controller.Tools.Add(dataZoomTool);
  }

  private void DataZoomTool_EndDrag(object sender, EventArgs e)
  {
   MessageBox.Show("End drag");
  }

Hope this helps - let us know if you have any questions or meet any problems.

Best Regards,
Nevron Support Team

Hi Team,
I am using zoom for both WPF(NChartControl) and Web application(NThinChartControl). Initially I have scale breaks in my chart with zooming enabled, as soon as user zoom into the chart I want to clear scale breaks, I found a way to do that for NThinChartControl in Nevron.Chart.ThinWeb.NDataZoomTool, I set DataZoomCallback and then in OnDataZoom method I have logic to clear scale breaks.

I wanted to know is it possible to have this functionality in NChartControl? Is there any other workaround to achieve what I want to achieve?

Thanks and regards
Manal