How to display only one drop down for selected id in ASP.NET

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C#

hello i want to display only one drop down in gridview using asp.net. suppose i have an id =5. and i am loading the data in gridview with drop down . here i have successfully add drop down in gridview column but here i want to populate the drop down only for row where id = 5. and other row of grid should contain label.
please help me

What I have tried:

<asp:TemplateField>
    <ItemTemplate>
        <asp:DropDownList ID="myddl" runat="server"></asp:DropDownList>
    </ItemTemplate>
</asp:TemplateField>