How do I...How to find TemplateField controls on GridViews SelectedIndexChanged event

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C#

ASP.NET

Gridview

I have a gridview, in that I have a asp hyperlink control inside TemplateField but I am not able to find the control in SelectedIndexChanged event. I want to get the text of the hyperlink.

I am using CommandField for selecting the row.

CS Code -

GridViewRow row = gridViewShipments.Rows[gridViewShipments.SelectedIndex];
HyperLink link = (HyperLink)row.FindControl("poNum"); // here link is always null.

ASPX Code -

<asp:TemplateField>
        <ItemTemplate>
            <asp:HyperLink ID="poNum" Text='<% Eval("poNum") %>' NavigateUrl="#" runat="server"></asp:HyperLink>
        </ItemTemplate>
</asp:TemplateField>

Any idea why its always null ?