[C#-WEB] Trouble finding controls in Update panel

[karthik25]

Hi All,

I have a problem in finding control in a dynamically created updated panel. I have given the code below. Following is just a starting effort in a completely dynamic user control. I am experimenting before getting to the actual part. This is what I am trying to do:

* Create a tab container dynamically

* Create 5 tabs dynamically

* Add an update panel to each of the tabs

* Add a label to each of the update panels

* Add an OnLoad event to each of the tabs and change the contents of the label added

But I am not able to accomplish the last part, I am not sure how to access the label dynamically added to the update panel

I have given the code below. Please help me in this regard.

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using AjaxControlToolkit;
  
public partial class EvaluationsWidget : System.Web.UI.Page
{
   protected string[] tabnames = {"All","Contact Centers","Networks","Technology Planning"};

    protected Label lbl;
   
    protected void Page_Load(object sender, EventArgs e)
     {
          ArrayList al = new ArrayList();
  
          for (int i = 0; i < 20; i++)
          al.Add(i.ToString());
  
          TabContainer tabContainer = new TabContainer();
          tabContainer.ID = "tbContainerMain";
          tabContainer.Width = 500;
   
          for (int i = 0; i < tabnames.Length; i++)
          {
              TabPanel tabPanel = new TabPanel();
              tabPanel.ID = "evaluationsPanel" + i.ToString();
              tabPanel.HeaderText = tabnames[i];
              tabPanel.Load += new EventHandler(tabPanel_Load);
  
              UpdatePanel updPanel = new UpdatePanel();
              updPanel.ID = "evaluationsUpdatePanel" + i.ToString();
              updPanel.UpdateMode = UpdatePanelUpdateMode.Conditional;
  
              lbl = new Label();
              lbl.ID = "lbl" + i.ToString();
              lbl.Text = "Label " + i.ToString();
              updPanel.ContentTemplateContainer.Controls.Add(lbl);
  
              tabPanel.Controls.Add(updPanel);
              tabContainer.Controls.Add(tabPanel);
          }

          form1.Controls.Add(tabContainer);
      }
  
      void tabPanel_Load(object sender, EventArgs e)
      {
          TabPanel tbPanel = (TabPanel)sender;
  
          //This doen't work, I need help here
          this.lbl.Text = "Clicked";
       }
    }

Thanks,

Karthik

[TTCEric]

You need a 'Handles TabControl.OnLo ad' appended to the end of the function signature like this

private sub MyTabControl(By Val sender As System.Object, ByVal e As System.EventArg s) Handles MyTabControl.On Load

[karthik25]

Hi Eric,

Thank you for your reply. What you've said is for VB. Net. I looked and found out that "handles" keyword and its functionality isn't available in C#. And I also found out that "AutoEventWireu p" should be set to true in C# as "handles" cannot be used in C#.

I have set auto event wireup to true in my page, Still it doesn't work. Please note that the label is created dynamically and added to the update panel. How am I supposed to access that label in the update panel?

Thanks again for replying

[TTCEric]

Oops. Didnt notice it was C#.

Ok, I found a link related to what you need. A good google keyword search is C# Event Handling. There are actually several ways to handle events in C#. This one I found most easier to follow:

http://www.c-sharpcorner.com/UploadFile/anandnarayanswamy/EventHandlinginCSharp11282005012049AM/EventHandlinginCSharp.aspx

[karthik25]

Thanks a lot for your replies Eric. I was able to solve the problem! Thanks again!