ASPX事件未触发

Question

I just want to ask what's the problem in my codes here? The OnSelectedIndexChanged event in #cbList is working fine but the ondrop event in #sortable2 is not working. I tried placing it inside and outside the update panel. The code that is being called in the ondrop is in code behind. It just change the dummyText's text. Here's my code:

<form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>

    <asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers="true">
        <ContentTemplate>

            <input type="hidden" runat="server" id="hdnSelectedValue" />
            <asp:CheckBoxList ID="cbList" runat="server" AutoPostBack="true" OnSelectedIndexChanged="cbList_SelectedIndexChanged">
                <asp:ListItem Text="One" Value="1">
                </asp:ListItem>
                <asp:ListItem Text="Two" Value="2">
                </asp:ListItem>
                <asp:ListItem Text="Three" Value="3">
                </asp:ListItem>
                <asp:ListItem Text="Four" Value="4">
                </asp:ListItem>
                <asp:ListItem Text="Five" Value="5">
                </asp:ListItem>
            </asp:CheckBoxList>
            <br />
            <asp:Label ID="lblSelection" runat="server"></asp:Label>
            <asp:Label ID="dummyText" runat="server" Text="Here"></asp:Label>

            <ul id="sortable2" runat="server" class="connectedSortable" ondrop="Change_Text"></ul>

        </ContentTemplate>

    </asp:UpdatePanel>
</form>    

Answer 1

ondrop="" is client side event.
You cannot wired up this event in code behind.

Check this link for more information on OnDrop event