<asp:GridView ID="gv" runat="server" OnRowCommand="gv_RowCommand">
<Columns>
<asp:TemplateField HeaderText="下载">
  <ItemTemplate>
  <asp:LinkButton ID="LinkButton1" CommandArgument='<%# Eval("id") %>' runat="server" Visible="False">下载</asp:LinkButton>
  </ItemTemplate>
  </asp:TemplateField>
<Columns>
</asp:GridView>

------解决方案--------------------
这样，简单
HTML code

<asp:TemplateField HeaderText="编辑">
                    <ItemTemplate>
                        <asp:LinkButton ID="LinkButton5" runat="server" CommandName="myCmd" CommandArgument='<%# Eval("id") %>'>编辑</asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField>