title: Chart series point added not sync with X axis
body: <p>I try to draw Chart via C# with table as picture.
  However, as you can see A4 data in date: 7 and 8/6 should stay with same 7 and 8/6 X-Axis, abnormal here all of them left to 5 &amp; 6/6 X-Axis. Could you help me to fix it.</p>
  
  <p><a href="https://i.stack.imgur.com/pgVPS.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pgVPS.jpg" alt="enter image description here"></a></p>
  
  <pre><code>for (int i = 0; i &lt; 14; i++)
          {
              string productname = dataGridView1.Rows[i].Cells[0].Value.ToString();
              string datetime = dataGridView1.Rows[i].Cells[2].Value.ToString();
              int para = Convert.ToInt16(dataGridView1.Rows[i].Cells[1].Value);
              if (chart_dashboard.Series.IndexOf(productname) != -1)
              {
                  chart_dashboard.Series[productname].Points.AddXY(datetime, para);
                  chart_dashboard.ChartAreas[0].AxisX.Interval = 1;
              }
              else
              {
                  chart_dashboard.Series.Add(productname);
                  chart_dashboard.Series[productname].Points.AddXY(datetime, para);
                  chart_dashboard.ChartAreas[0].AxisX.Interval = 1;
              }
          }
  </code></pre>