title: In asp.net mvc3 chart helper how to add marker to the series data
body: <p>In asp.net mvc3 using chart helper, i am trying to draw line chart with number of series. I want to add marker/ highlight the points of a single series. </p>
  
  <p>My Code is </p>
  
  <pre><code>var chart = new Chart(900, 500, ChartTheme.Blue).AddTitle("Status: "+ status)
              .SetXAxis("Year", 0, 60)
              .SetYAxis("Age", 0, 30)
              .AddSeries(chartType: "line", xValue: XYear, yValues: YAge, name:"1st series",markerStep:5)
              .AddSeries(chartType: "line", xValue: x1, yValues: y1, name: "2nd series")
              .AddSeries(chartType: "line", xValue: x2, yValues: y2, name: "3rd series")
              .AddLegend()
              .GetBytes("png");
  
  
              return File(chart, "image/png");
  </code></pre>
  
  <p>In the 1st series all the points which is given as an input need to be highlighted. How this can be achieved with chart helper. </p>