Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Use Fincontrol on an aspx form using c#

Posted on 2008-10-17
7
Medium Priority
?
481 Views
Last Modified: 2013-12-17
I am trying to use FindControl on aspx form using c#.  My code is as follows and FinControl returns null.  Thanks

<%@ Page Language="C#" MasterPageFile="~/Site1.Master" AutoEventWireup="true" Theme="Default" CodeBehind="Default.aspx.cs" Inherits="Application.Web.Default" Title="Information Database" %>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
<table width="100%">
        <tr>
            <td>
               <div  ><asp:LinkButton Text="Clear" ID="ClearButton1" CssClass="clearButton" runat="server" OnClick="ClearButton_Onclick" CommandArgument="OfficeList"></asp:LinkButton></div>
            </td>

        protected void ClearButton_Onclick(object sender, EventArgs e)
        {//CommandArgument contains name of control to be found.
            LinkButton lb = sender as LinkButton;
             ListBox List = (ListBox)FindControl(lb.CommandArgument);
            List.SelectedIndex = -1;
0
Comment
Question by:eshurak
[X]
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
  • 3
  • 2
  • 2
7 Comments
 
LVL 3

Expert Comment

by:JunkMan
ID: 22746350
If the control "OfficeLis" being added progamatically or does it exist on the page?
0
 
LVL 3

Expert Comment

by:JunkMan
ID: 22746351
sorry typo there, meant "OfficeList"
0
 
LVL 26

Expert Comment

by:Anurag Thakur
ID: 22747548
you cannot find a control by using the commandargument

if you use lb.ID you will be able to find your control and later you can use your command argument to take a decision what has to be done
0
PowerShell Core for Advanced Linux Administrators

Understand advanced principals around Powershell Core with a focus on the Linux Administrator.  This course covers how to administer numerous environments across multiple platforms including Linux, Azure, AWS, and Google Cloud from a single shell instance.

 
LVL 3

Author Comment

by:eshurak
ID: 22760130
JunkMan - OfficeList already exists on the page.  No new objects are being created programatically.

Ragi - the lb.ID is the name of the Label that is being clicked.  I don't want to find my labels.  I want to use the command arguement of the Label to find the corresiponding listbox and clear it's selected value.  There are several label and listbox pairs on the aspx page.
0
 
LVL 26

Expert Comment

by:Anurag Thakur
ID: 22760392
If you look up for the definition of FindControl in MSDN, it tells that you need to pass the ID of the control. Passing anything else will not return you the control.
So as i previously stated you cannot find your control using the command name you have to use the ID
0
 
LVL 3

Author Comment

by:eshurak
ID: 22761537
Ragi- Right, ID is string which is what is contained in the CommandArgument.

Below is the example from MSDN (http://msdn.microsoft.com/en-us/library/486wc64h.aspx) using a string:

Control myControl1 = FindControl("TextBox2");

0
 
LVL 3

Accepted Solution

by:
eshurak earned 0 total points
ID: 22761830
Found the solution:

            LinkButton lb = sender as LinkButton;
            ListBox List = (ListBox)Master.FindControl("ContentPlaceHolder1").FindControl(lb.CommandArgument);
            List.SelectedIndex = -1;

I had to be very specific on where to look.  Now List is no longer null.  
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

In my previous two articles we discussed Binary Serialization (http://www.experts-exchange.com/A_4362.html) and XML Serialization (http://www.experts-exchange.com/A_4425.html). In this article we will try to know more about SOAP (Simple Object Acces…
It was really hard time for me to get the understanding of Delegates in C#. I went through many websites and articles but I found them very clumsy. After going through those sites, I noted down the points in a easy way so here I am sharing that unde…
Video by: ITPro.TV
In this episode Don builds upon the troubleshooting techniques by demonstrating how to properly monitor a vSphere deployment to detect problems before they occur. He begins the show using tools found within the vSphere suite as ends the show demonst…
In this video you will find out how to export Office 365 mailboxes using the built in eDiscovery tool. Bear in mind that although this method might be useful in some cases, using PST files as Office 365 backup is troublesome in a long run (more on t…

688 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