<asp:ListView ID="lvQuiz" runat="server">
<LayoutTemplate>
<fieldset>
<ul>
    <asp:PlaceHolder ID="itemplaceholder" runat="server"></asp:PlaceHolder>
</ul>
</fieldset>
<asp:Button ID="cmdSubmit" runat="server" Text="Submit" OnClick="cmdSubmit_Click" />

</LayoutTemplate>
<ItemTemplate>
    <li>
        <fieldset>
            <legend>
                <asp:Label ID="lblQuestionText" runat="server" Text='<%# Bind("Question.QuestionText") %>' />
            </legend>
            <asp:RadioButtonList ID="rblResponse" runat="server" DataTextField="ResponseText" DataValueField="Id"
                DataSource='<%# Bind("Question.PossibleResponses") %>'>
            </asp:RadioButtonList>
        </fieldset>
    </li>
</ItemTemplate>

var Q = (Quiz)Session["Quiz"];

foreach (var item in lvQuiz.Items)
{
    var itemValues = new OrderedDictionary();
    lvQuiz.ExtractItemValues(itemValues, item, true);

    var myQuestion = Q.UserResponses.Keys
        .Where(x => x.QuestionText == itemValues["Question.QuestionText"])
        .Single();

    Q.UserResponses[myQuestion] = itemValues["Question.PossibleResponses"].SelectedItem
}