getting selected value when there is no selected value in asp.net

So i have the code in my page below which is displayed for the first time to collect data from the user, when I  don't selected anything, submit the screen and then execute the statement:

If Insurance.SelectedValue Is Nothing Then

it fails this check.  It also stores a 'false' in my database, when I
store
Insurance.SelectedValue, tied to a bit field in my database.



How can I find out if there was nothing selected by the user.

<asp:RadioButtonList ID="Insurance" runat="server" RepeatDirection="Horizontal">
                        <asp:ListItem Value="True">Yes</asp:ListItem>
                        <asp:ListItem Value="False">No</asp:ListItem>
                    </asp:RadioButtonList>

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