trigger in ajax updatepanel in asp.net c#

<asp:UpdatePanel ID="mncontainer" runat="server">
<contenttemplate>
</>
<Triggers>
            <asp:AsyncPostBackTrigger ControlID="btnsave" EventName="Click" />
            <asp:PostBackTrigger ControlID="btncustimg" />
            <asp:AsyncPostBackTrigger ControlID="mnplanlist"
                EventName="SelectedIndexChanged" />
            <asp:AsyncPostBackTrigger ControlID="planlist"
                EventName="SelectedIndexChanged" />
        </Triggers>

</>