title: how to make the cursor lines to follow the mouse in charts using C#
body: <p><img src="https://i.stack.imgur.com/FpNEJ.jpg" alt="enter image description here"></p>
  
  <p>The picture below shows a chart in my project. As you can see there are two dotted crossing lines. I’m asked to make it to follow the mouse, but now only if I click on the chart it moves. I tried to use CursorPositionChanging but it didn’t work.
  CursorEventHandler also is not shown in the command below:</p>
  
  <pre><code> this.chart1.CursorPositionChanging += new System.Windows.Forms.DataVisualization.Charting.Chart.CursorEventHandler(this.chart1_CursorPositionChanging);
  </code></pre>
  
  <p>do we need to add extra lib for that? 
  So I have two problems now:
  1.  Make the lines to follow the mouse
  2.  Missing CursorEventHandler</p>
  
  <p>the project is window form application with C#</p>