 <p>You have to create a new serie and then add it to your chart.</p> <pre><code>Series series1 = new Series("series1"); chart1.Series.Add(series1); </code></pre> <p>You can also create them in your .aspx.</p> <pre><code>&lt;form id="form1" runat="server"&gt; &lt;asp:Chart ID="Chart1" runat="server" ImageType="Png"&gt; &lt;ChartAreas&gt; &lt;asp:ChartArea Name="ChartArea1"&gt;&lt;/asp:ChartArea&gt; &lt;/ChartAreas&gt; &lt;Legends&gt; &lt;asp:Legend Name="Legends1"&gt;&lt;/asp:Legend&gt; &lt;/Legends&gt; &lt;Series&gt; &lt;asp:Series Name="Series0"&gt;&lt;/asp:Series&gt; &lt;asp:Series Name="Series1"&gt;&lt;/asp:Series&gt; &lt;asp:Series Name="Series2"&gt;&lt;/asp:Series&gt; &lt;/Series&gt; &lt;/asp:Chart&gt; &lt;/form&gt; </code></pre>