FileUploader in gridview.

Question

Hi,

I need to upload file on each row of grid. I am using fileUploader as following but fileUpload is not accessable while using  fu = (FileUpload)row.FindControl("fu_doc");

<asp:TemplateField HeaderText="Select file">

    <ItemTemplate>                               

           <asp:FileUpload ID="fu_doc" runat="server" />

    </ItemTemplate>

</asp:TemplateField>

Please suggest.