Set checkbox in datagrid through code

[microsoft.public.dotnet.languages.csharp]

I have a numeric Oracle field which stores -1 for true and 0 for false.
I am trying to populate a checkbox in a datagrid. In my SQL statement,
I used the Decode function so that when it populates the dataset that I
would store the string 'true' and 'false' rather than a numeric value.
I did this because I thought it would make it easier to actually set the
value in the checkbox. Anyway, I bind the dataset to the datagrid. In
my HTML code, the checkbox is contained in a templatecolumn:

<asp:CheckBox id="chkStrainerFuelLine" runat="server" Checked='<%#
(bool) DataBinder.Eval(Container.DataItem, "strainer_on_fuel_line_bool")
%>' Enabled="False"></asp:CheckBox>

However, this will not work. It complains that "Specified cast is not
valid."

I have even tried it without the "(bool)" cast and it still didn't work.

The data in my database has the value stored as either a -1 or 0. In
either case, I just want to set the check box to checked or unchecked.
I was even wondering if I needed to use one of the d atagrid's events to
do this.

Any ideas or help is appreciated.

Thanks,
Marty

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