Loop through controls in UpdatePanel

How can I loop through the <li> controls below;

<ul>
<asp:UpdatePanel ID="pnSubMenu" runat="server">
<ContentTemplate>
<li class="fa fa-bars" id="liOrders1" runat="server">&nbsp; Option 1</li>
<li class="fa fa-bars" id="liOrders2" runat="server">&nbsp; Option 2</li>
<li class="fa fa-bars" id="liOrders3" runat="server">&nbsp; Option 3</li>
<li class="fa fa-bars" id="liShop1" runat="server">&nbsp; Option 1</li>
<li class="fa fa-bars" id="liShop2" runat="server">&nbsp; Option 2</li>
<li class="fa fa-bars" id="liShop3" runat="server">&nbsp; Option 3</li>
</ContentTemplate>
</asp:UpdatePanel>
</ul>

Any help really appreciated.