<ComponentArt:GridServerTemplate ID="ItemNumberTemplate">

    <Template>

        <asp:HyperLink Target="_blank" ID="lnkItemnmbr" runat="server"  

            NavigateUrl='<%# "SubordersOnHoldBuyerDetail.aspx?itemnmbr=" 

                    & Container.DataItem("itemnmbr") %>'

             Text='<%# Container.DataItem("itemnmbr") %>'></asp:HyperLink>

   </Template>

</ComponentArt:GridServerTemplate>