Render controls from html string

Iam getting the below string in a variable"result" after xslt tranformation.
if i do Page.ParseControl(result) iam able to render controls to the page.
But the requirement is different.
I have 4 place holders in that aspx page.I need to bind div id="Section1" to placeholder1,
div id="Section2" to placeholder2 and similar the other two sections also  to the corresponding place holder.
Please help me out how can i loop and add controls to corresponding place holder.
result =
<div id="Section1" xmlns:asp="remove">
  <asp:Label id="lblSection1" runat="server" text="section1" />
  <asp:RequiredFieldValidator ErrorMessage="Mandatory Field-1" runat="server" ControlToValidate="txtNameSection1" />
  <asp:TextBox id="txtNameSection1" runat="server" />
</div&g ...