Getting the count of the checkbox selected items inside a nested repeater.

<asp:Repeater runat="server" ID="rptCategories"     onitemcommand="rptCategories_ItemCommand"   >
 <HeaderTemplate>

</HeaderTemplate>
<ItemTemplate>

 <a id='<%# DataBinder.Eval(Container.DataItem, "CategoryId")%>' ></a><strong>
<asp:Literal ID="litCatName" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "CategoryName")%>'></asp:Literal> </strong>
  (Any   <asp:Literal ID="litQuantity" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "Quantity")%>'></asp:Literal>)
 </td>
  </tr>
  <asp:Repeater runat="server" ID="rptMenuItemsInCategory" DataSource='<%# System.Data.DataRowView)Container.DataItem). Row.GetChildRows("CategoryToMenu") %>'    OnItemCommand="rptMenuItemsInCategory_ItemCommand"  >
                              <HeaderTemplate>
                              </HeaderTemplate>
                              <ItemTemplate>

                                      <asp:CheckBox ID="Chkmenu" runat="server" OnCheckedChanged="Chkmenu_checkchanged" AutoPostBack="true" />

                                      <asp:Label ID="lblitemname" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "[\"ItemName\"]")%>'></asp:Label>
                                      <asp:HiddenField ID="hidmenuid" runat="server" Value='<%# DataBinder.Eval(Container.DataItem, "[\"MenuId\"]")%>' />
                                      <asp:HiddenField ID="hidCatname" runat="server" Value='<%# DataBinder.Eval(Container.DataItem, "[\"CategoryName\"]")%>' />
                                      <asp:HiddenField ID="hidCatId" runat="server" Value='<%# DataBinder.Eval(Container.DataItem, "[\"CategoryId\"]")%>' />

                              </ItemTemplate>
                              <FooterTemplate>

                              </FooterTemplate>
                            </asp:Repeater>    </table>
                        </td>
                      </tr>
                    </ItemTemplate>
                    <FooterTemplate>

                      </table>
                    </FooterTemplate>
                  </asp:Repeater>