จับ Event Control ใน Gridview ใน Repeater ยังไงครับ

protected void rptDetail_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
            {
                GridView gv = (GridView)e.Item.FindControl("gvDetail");
                gv.DataSource = dtEmpDistinct;
                gv.DataBind();
            }
        }


<asp:Repeater ID="rptDetail" runat ="server" OnItemDataBound="rptDetail_ItemDataBound" >
              <HeaderTemplate>
              </HeaderTemplate>                          
              <ItemTemplate>
              <tr>
                  <td>
                      <asp:GridView ID="gvDetail" runat="server"  AutoGenerateColumns="false"
                          CellPadding="3" HorizontalAlign="Center" GridLines="Vertical" Width="100%" ShowFooter="True" >                       
                             <Columns>
                                <asp:TemplateField HeaderText="รายการ">
                                     <ItemTemplate>
                                         <asp:Label ID="lblAllRequestType" runat="server" Text='<%#bind("description")%>'>
                                          </asp:Label>
                                     </ItemTemplate>            
                                </asp:TemplateField>
                                <asp:TemplateField HeaderText="จำนวน">
                                     <ItemTemplate>
                                         <asp:TextBox ID="txtQuantity" runat="server" Text='<%#bind("quantity")%>' Visible="false">
                                         </asp:TextBox>
                                     </ItemTemplate>
                                </asp:TemplateField>
                                <asp:TemplateField HeaderText="">
                                     <ItemTemplate>
                                         <asp:Button ID="btnEdit" runat="server" Text="Edit">
                                     </ItemTemplate>
                                </asp:TemplateField>
                              </Columns>
                         </asp:GridView>
                    </td>
                 </tr>
</asp:Repeater>