title: Get Y value of series from the X Cursor position where a ChartArea is clicked on
body: <p>I would like to get the Y Value for a series corresponding to the X position of a ChartArea that the user has clicked-upon. </p>
  
  <p>I have tried to capture the X position of the mouse within the chartarea that is clicked upon but I am getting NaN returned for the result:</p>
  
  <pre><code> private void chart_Click(object sender, EventArgs e)
      {
         double XVal = chart.ChartAreas[0].CursorX.Position;
      }
  </code></pre>
  
  <p>Once I have got the X position in the chartarea where the user has clicked the mouse, I would then like to use that to get the Y value of a series at that x-position. </p>