title: Charts add multiple series from datatable with 3 series
body: <pre><code>  SqlDataAdapter da = new SqlDataAdapter("select p.mn as dta,p.quan as 
      quan,i.quan,iss.quan from purchase p join inward i on p.mn=i.nm join issue iss on p.mn = iss.nm where p.pid = 4 and i.pid = 4 and iss.pid = 4", con);
      DataTable dt = new DataTable();
      da.Fill(dt);
      chart1.DataSource = dt;           
      chart1.Series["Purchase"].XValueMember = "mn";
    chart1.Series["Purchase"].YValueMembers ="quan";
  </code></pre>
  
  <p>i try it but chart is not generated</p>
  
  <p><a href="https://i.stack.imgur.com/OB4Jq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/OB4Jq.png" alt="enter image description here"></a></p>