Set HTML attribute dynamically

I'm trying to generate HTML dynamically, in a way that looks a bit like MVC. However I'm trying to achieve this in Webforms.

I managed to pass a list to my aspx page, but using the properties in the html attributes doesn't seem to work:

My aspx page:

<% For Each question As WorkOrderQuestionDAO In Session("WorkOrderQuestions") %>
    <tr>
        <td style="width: 620px"><%= question.Question %></td>
        <td style="width: 300px">
        <% Select Case question.WorkOrderAnswerTypeID
            Case 1 %>
                <asp:RadioButtonList ID='<%# question.QuestionID %>' runat="server" RepeatDirection="Horizontal" RepeatLayout="Flow">
                    <asp:ListItem Value="-1">YES</asp:ListItem>
                    <asp:ListItem Value="0">NO</asp:ListItem>
                </asp:RadioButtonList>
            <%Exit Select
            Case 2 %>
                <asp:RadioButtonList ID='<%# question.QuestionID %>' runat="server" RepeatDirection="Horizontal" RepeatLayout="Flow">
                    <asp:ListItem Value="-1">YES</asp:ListItem>
                    <asp:ListItem Value="0">NO</asp:ListItem>
                    <asp:ListItem Value="1">NA</asp:ListItem>
                </asp:RadioButtonList>
            <% Exit Select
        End Select%>
     </td>
  </tr>
<% Next %>

So I try to set the ID of each RadioButtonList automatically, by trying to insert the question.QuestionID property. However the error i'm getting is:

The ID property of a control can only be set using the ID attribute in the tag and a simple value. Example:

I tried:

ID='<%# question.QuestionID %>'
ID='<%= question.QuestionID %>'
ID='<%= Eval("question.QuestionID") %>'

At this point I don't know what syntax to use. I don't think it should be to hard, but I couldn't find an answer using Google and find it hard to come up with the proper search terms.

The <tr>, <td> and <asp:RadioButtonList> generation goes fine by the way.