Catching click event inside an UpdatePanel of a User Control

Posted on 2009-07-06
Last Modified: 2012-05-07
I was experimenting with dynamically loaded user controls.  

For some reason, when I load (from PickListUser) my PickList control, the control is displayed reasonably - with Region.xml as given, the repeater shows two lines with a name and button on each.

However, when I click the button, ONLY the load code on my host page (PickListUser) is called (with IsPostBack==true), neither the load event nor the click event on the PickList code behind are triggered.
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="Picklist.ascx.cs" Inherits="Picklist" %>
<input type="hidden" runat="server" ID="path" />
<input type="hidden"  runat="server" ID="parent" />
<asp:Repeater ID="Repeater1" runat="server" >
<asp:UpdatePanel runat="server" ID="mypanel" UpdateMode="Conditional">
<asp:Label runat="server" ID="name" Text='<%# Eval("Name") %>' />
<asp:Button runat="server" ID="select" Text="select"  /><br />
<asp:Label runat="server" ID="display" />
using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Picklist : System.Web.UI.UserControl
    protected void Page_Load(object sender, EventArgs e)
        if (!IsPostBack)
            string[] elements = path.Value.Split(',');
            XmlDataSource source = new XmlDataSource();
            source.DataFile = "App_Data/" + elements[0] + ".xml";
            Repeater1.DataSource = source;
        foreach (RepeaterItem x in Repeater1.Items)
            (x.Controls[1].Controls[0].Controls[3] as Button).Click += Command;
    protected void Command(object source, EventArgs e)
        display.Text = "foo";
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="PickListUser.aspx.cs" Inherits="PickListUser" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<head runat="server">
    <form id="form1" runat="server">
<asp:ScriptManager runat="server" ID="mgr" />
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
public partial class PickListUser : System.Web.UI.Page
    protected void Page_Load(object sender, EventArgs e)
        if (!IsPostBack)
            Control main = LoadControl("~/Picklist.ascx");
            HtmlInputHidden path = main.FindControl("path") as HtmlInputHidden;
            path.Value = "region,country,call";
<?xml version="1.0" encoding="utf-8" ?>
  <region name="america" id="1" parent="0"/>
  <region name="europe" id="2" parent="0"/>

Open in new window

Question by:Jens Fiederer
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
LVL 96

Accepted Solution

Bob Learned earned 500 total points
ID: 24787982
If you are going to dynamically load the control, then it needs to be loaded all the time.  You must reload the control even if the page posts back, or none of the events will be wired up.
LVL 23

Author Closing Comment

by:Jens Fiederer
ID: 31600293
Thanks - reloading the whole kibosh did it for me ...  to my surprise, without losing state in the items I was reloading!

Featured Post

Creating Instructional Tutorials  

For Any Use & On Any Platform

Contextual Guidance at the moment of need helps your employees/users adopt software o& achieve even the most complex tasks instantly. Boost knowledge retention, software adoption & employee engagement with easy solution.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

IntroductionWhile developing web applications, a single page might contain many regions and each region might contain many number of controls with the capability to perform  postback. Many times you might need to perform some action on an ASP.NET po…
This article shows how to deploy dynamic backgrounds to computers depending on the aspect ratio of display
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…
In this video, viewers will be given step by step instructions on adjusting mouse, pointer and cursor visibility in Microsoft Windows 10. The video seeks to educate those who are struggling with the new Windows 10 Graphical User Interface. Change Cu…

635 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question