title: adding values to listbox from the drop down selected item
body: <p>The code is from usercontrol </p>
  
  <pre><code> &lt;asp:DropDownList ID="DropDownList2" runat="server"&gt;
  &lt;asp:ListItem&gt;Maer&lt;/asp:ListItem&gt;
  &lt;asp:ListItem&gt;Cor&lt;/asp:ListItem&gt;
  </code></pre>
  
  <p>En<br>
     </p>
  
  <pre><code>&lt;asp:Button ID="btn1" runat="server" Style="font-size: small; width: 70px; font-weight:    lighter" Text="Add" OnClick="btn1_click" /&gt;
  
   &lt;asp:ListBox ID="ListBox2" runat="server" SelectionMode="Multiple" Width="220px"&gt;                       &lt;/asp:ListBox&gt;
  </code></pre>
  
  <p>javascript function</p>
  
  <pre><code>function btn1_click()
   {
  </code></pre>
  
  <p>How do I get the values from dropdown and add to listbox?</p>