<asp:TemplateField HeaderText="Position Inclusive Dates" HeaderStyle-Width="75px" SortExpression="">
<ItemTemplate>
<asp:Label ID="_lblPositionIncDate" width="75px" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.PositionIncDate") %>'></asp:Label>
</ItemTemplate>
<EditItemTemplate>
<asp:TextBox ID="_tbPositionIncDate" width="75px" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.PositionIncDate") %>'></asp:TextBox>
</EditItemTemplate>
<HeaderStyle HorizontalAlign="Center" />
</asp:TemplateField>
More on => BoundField::DataFormatString Property