How to set the string Empty to the radiobuttonlist in gridview

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C#

Hi,

In my application I am using the gridview. In that I am using the Radiobutton list with two list item value "Y" and "N". In my form I want to check the condition for that radiobutton list. If it is "Y" the radiobutton to be selected and if it is "N" it will be selected. If it is Empty No need to select the Radiobuttonlist. My problem is When I am binding the data it Showing the error that the radiobutton list value is present for string.empty but it is not available in the list of item. How to solve this problem. Here is the code

<asp:TemplateField HeaderText="Status">
                                        <ItemTemplate>
  <asp:RadioButtonList ID="rdbConsultantInvolved" runat="server" CssClass="css_radiobutton_list"
SelectedValue='<%#DataBinder.Eval(Container.DataItem ,"SolutionEngineerConfirmId")%>' RepeatDirection="Horizontal"
AppendDataBoundItems="True">
<asp:ListItem Value="N" Text="Open" ></asp:ListItem>
<asp:ListItem Value="Y" Text="Confirmed"></asp:ListItem>
</asp:RadioButtonList>

                                        </ItemTemplate>
                                        <HeaderStyle HorizontalAlign="center" VerticalAlign="Middle" />
                                        <ItemStyle />
                                    </asp:TemplateField>

Thanks