Declarative SQL Problem

I can't figure out what is wrong with the code below. 

 The first line prints out correctly when I am logged in

If I substitute the actual username in the SQL, the Repeater works fine, printing out the item from the db.
But using
WHERE USERNAME='<%= User.Identity.Name%>'
in the SelectCommand returns no rows.

Can anyone help?

Thanks,

Michael

<h3>News  for <%=User.Identity.Name%></h3>

<asp:SqlDataSource ID="SqlDataSource2" runat="server"

ConnectionString="<%$ ConnectionStrings:NEWWEB %>"

ProviderName="<%$ ConnectionStrings:NEWWEB.ProviderName %>"

SelectCommand="SELECT USERNAME FROM ASPNET_MEMBERSHIP WHERE USERNAME='<%= User.Identity.Name%>' ">

</asp:SqlDataSource>

<asp:Repeater ID="FirmAlertsRepeater" runat="server" DataSourceID="SqlDataSource2">

<ItemTemplate>

<b><%# DataBinder.Eval(Container.DataItem, "USERNAME")%></b> &mdash; <br />

 

</ItemTemplate>

</asp:Repeater>