You can use a templatefield & drop a label control inside it. Something like
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lblStatus" runat="server" Text='<%# (Convert.ToDecimal(Eval("UnitPrice")) > 0) ? "True" : "False" %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
Alternatively, you can also use RowDataBound
event of gridview & use FindControl
to apply the same.