ASP.NET UpdatePanel Error htmlfile: Unknown runtime error, updatePanelElement.innerHTML=rendering

Question

I get this error when debugging my ASP.NET web application after I trigger an UpdatePanel:

htmlfile: Unknown runtime error

and "updatePanelElement.innerHTML=rendering" is highlighted in a ScriptResource.axd file.

Answer 1

This seems to happen because I've got my UpdatePanel within an ordered list <ol> container. And I've got list item <li> tags within my UpdatePanel's ContentTemplate.

<ol>
    <li>...</li>
    <asp:UpdatePanel ...>
        <ContentTemplate>
            <li id="lione" runat="server">...</li>
            <li id="litwo" runat="server">...</li>
        </ContentTemplate>
        <Triggers>
            ...
        </Triggers>
    </asp:UpdatePanel>
    <li>...</li>
</ol>

It makes sense to me this way, but I guess I'll need to rethink my page layout.