This template column should show forecolor as red when the bit
datafield 'SIG' is true.

<asp:TemplateColumn HeaderText="Area">
    <ItemStyle HorizontalAlign="left"></ItemStyle>
        <ItemTemplate>
            <asp:HyperLink runat="server" ForeColor='<%#
IIf(DataBinder.Eval(Container.DataItem, "SIG"), "red","black") %>'
Text='<%# DataBinder.Eval(Container, "DataItem.AREA_NAME") %>'
ID="Hyperlink1">
            </asp:HyperLink>
        </ItemTemplate>
    </asp:TemplateColumn>

I've checked the data - no nulls, error msg is : specified cast is not
valid. Definately the forecolor since if I remove it it runs fine.
Thanks for all help !