这个listview为什么不触发事件，请高手解答上，多谢，代码贴下了

<asp:ListView ID="ListView1" runat="server" 
                onitemcommand="ListView1_ItemCommand" 
                onitemediting="ListView1_ItemEditing" onitemcanceling="ListView1_ItemCanceling"
                
  InsertItemPosition="LastItem" oniteminserting="ListView1_ItemInserting" 
            DataKeyNames="id" onitemdatabound="ListView1_ItemDataBound"
                >
            <LayoutTemplate>
            <table width="98%" b border="1" cellspacing="0" cellpadding="0" align="center" bordercolor="#CCCCCC" style="border-collapse: collapse;">
                <tr>
                   
                    <td background="~/Admin/images/right_tab_top.jpg" style="text-align: center">
                        QQ号码</td>
                    <td background="~/Admin/images/right_tab_top.jpg" style="text-align: center">
                        QQ描述</td>
                    <td background="~/Admin/images/right_tab_top.jpg" style="text-align: center">
                        显示顺序</td>
                    <td background="~/Admin/images/right_tab_top.jpg" style="text-align: center">
                        是否使用</td>
                    <td background="~/Admin/images/right_tab_top.jpg" style="text-align: center">
                        基本操作</td>
                </tr>
             <tr id="itemPlaceholder" runat="server" />
            </table>
            </LayoutTemplate>
            <ItemTemplate>            
               <tr >                           
                    <td style="text-align: center"><%# DataBinder.Eval(Container.DataItem, "QQContent")%></td>
                    <td style="text-align: center"><%# DataBinder.Eval(Container.DataItem, "QQType")%></td>
                    <td style="text-align: center"><%# DataBinder.Eval(Container.DataItem, "QQ_order")%></td>
                    <td style="text-align: center">
                        <asp:CheckBox ID="chk" runat="server" Enabled="False"/>
                        
                        <asp:HiddenField ID="HiddenField1" runat="server"  Value='<%#Eval("showflag") %>'/>
                        </td>
                    
                    <td style="text-align: center" width="120">
                        <asp:ImageButton ID="ImageButton1" ImageUrl="~/m/images/edit.gif" runat="server" CommandName="Edit"/>
                        <asp:ImageButton ID="ImageButton2" ImageUrl="~/m/images/del.gif" runat="server" CommandName="imgDelete"
                         CommandArgument='<%# DataBinder.Eval(Container.DataItem,"id") %>' />
                     </td>
                </tr>            
            </ItemTemplate>
            <EditItemTemplate>
               <tr >                           
                    <td style="text-align: center"><%# DataBinder.Eval(Container.DataItem, "QQContent")%></td>
                    <td style="text-align: center"><%# DataBinder.Eval(Container.DataItem, "QQType")%></td>
                    <td style="text-align: center">
                        <asp:TextBox ID="TextBox1" runat="server" Text='<%#Bind("QQ_order")%>'></asp:TextBox></td>
                    <td style="text-align: center">
                        <asp:CheckBox ID="chk" runat="server" /></td>
                    <td style="text-align: center" width="120">
                        <asp:Button ID="ImageButton1" CssClass="btn" runat="server" CommandName="Cancel" Text="取消"/>
                        <asp:Button ID="ImageButton2" CssClass="btn" runat="server" CommandName="imgUpdate" Text="更新"
                         CommandArgument='<%# DataBinder.Eval(Container.DataItem,"id") %>' />
                     </td>
                </tr>      
            </EditItemTemplate>
            <InsertItemTemplate>
                 <tr >                           
                    <td style="text-align: center"><asp:TextBox ID="txtqq" runat="server" Text='<%# Bind("QQContent")%>'></asp:TextBox></td>
                    <td style="text-align: center"><asp:TextBox ID="txttype" runat="server" Text='<%# Bind("QQType")%>'></asp:TextBox></td>
                    <td style="text-align: center"><asp:TextBox ID="txtorder" runat="server" Text='<%# Bind("QQ_order")%>'></asp:TextBox></td>
                   <td style="text-align: center">
                        <asp:CheckBox ID="chk" runat="server" /></td> 
                     <td style="text-align: center" width="120">                   
                    <asp:Button ID="ibtnAdd" CssClass="btn"  Text="插入"
                            runat="server" CommandName="Insert" style="height: 21px" />                   
               
                </tr>    
            </InsertItemTemplate>
            </asp:ListView>