Could not find control with id. 'btnGuardar' trigger for UpdatePanel 'UpdatePanel1'.

Question

I'm getting this error when I use an update panel, and a trigger AjaxControlToolkit accordion control.
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="frmUpload.aspx.vb" Inherits="DemoFileUploadVB.frmUpload"
MasterPageFile="~/BaseMaster.Master" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Accordion ID="Accordion1" runat="server" FadeTransitions="true" TransitionDuration="250"
FramesPerSecond="40" RequireOpenedPane="false" SuppressHeaderPostbacks="true">
<Panes>
<asp:AccordionPane runat="server">
<Header>
<a href="" onclick="return false;" class="Link">Open </a>
</Header>
<Content>
<div>
<asp:FileUpload ID="fu" runat="server" />
</div>
<div>
<asp:Button ID="btnGuardar" runat="server" Text="Guardar" /></div>
</Content>
</asp:AccordionPane>
</Panes>
</asp:Accordion>
</ContentTemplate>
<Triggers>
<asp:PostBackTrigger ControlID="btnGuardar" />
</Triggers>
</asp:UpdatePanel>
</asp:Content>
if it is not the right forum please move the thread to the right one

Answer 1

Hello,
The correct forum is ASP.NET forums.
Please remember to mark the replies as answers if they help and unmark them if they provide no help, this will help others who are looking for solutions to the same or similar problem.
thanks.
regards