Screen flickering while adding items at runtime..

Posted on 2004-08-30
Medium Priority
Last Modified: 2010-04-15

In my application, I have a Panel control when I add controls at runtime, dock them on panel top....and populate them...the screen flickering occur....It looks like item stays at the top of the pannel for 3-4 seconds until it gets populated...How I can solve this issue...

Thanks for the help, nauman.
Question by:nauman_ahmed

Expert Comment

ID: 11933933
You can use


at the Panel before adding the Controls, and then


But i think the problem is, that you run it all in the UI Thread, which will stop the UI for a while.

So you can let the Adding of the Controls run in a seperate Thread. For this you have to generate  a Delegate to Add the Controls to the UI (otherwise it's not Safe)

public delegate DelegateAddControl(System.Windows.Form.Panel pnl, Control ctrl);

public class yourapp
   private DelegateAddControl m_DelegateAddControl;
   Thread[] t_AddControl = new Thread[1];

   // after InitializeComponent();
   m_DelegateAddControl = new DelegateAddControl(this.AddControl);

   private void AddControl(System.Windows.Form.Panel pnl, Control ctrl)

   private void AddControl()
      t_AddControl[0] = new Thread(new ThreadStart(this.AddControlThread);

   private void AddControlThread();
      // Create your Control
      this.Invoke(this.m_DelegateAddControl, new object[] { this.paneltoadd, _controltoadd });

       // more you want to add

LVL 25

Author Comment

ID: 11935864
Thanks for the reply...Actually I am planning to program like this:

1. In Main form, I add controls on runtime depending on the user selection. This consist mostly on ListView.
2. I populate the list view using a class called UIDataManagement where I pass the ListView as a parameter.

Now where I should use a new thread? In UIDataManagement or in the MainForm? Also I tried to run an example based on your solution but it didn work...:(


Expert Comment

ID: 11936253
The Thread should run from the MainForm.

In the Thread you can add the ListViews and Populate them with the data. Otherwise you have to create new Threads for UIDataManagment.

Because you will change Controls in the UI Thread you have to use Delegate, otherwise it will be possible that your App throws Exceptions.

You can try it without Delegate, but it isn't Thread Safe. For more Information look at


Train for your Pen Testing Engineer Certification

Enroll today in this bundle of courses to gain experience in the logistics of pen testing, Linux fundamentals, vulnerability assessments, detecting live systems, and more! This series, valued at $3,000, is free for Premium members, Team Accounts, and Qualified Experts.


Expert Comment

ID: 11939069
Don't even try it without .. Strange behaviours can occur (believe me .. i had to find that out by myself ... )

Even if you won't get exceptions, some things won't work properly ..
LVL 11

Accepted Solution

Agarici earned 1000 total points
ID: 11942135
if you will use a thread to load the contents of the list, use contol.invoke to call the add function of the listview items collections.
otherwise you will get exceptions... even if it runs ok once, the second time may throw an exception...

btw, unless you have a realy huge list to load, creating another thread to load the items into the listview is not a good idea

LVL 25

Author Comment

ID: 11943483
Thanks for the reply experts. Actually this application is an outlook 2003 style application with 5 different navigation panes. Each navigation pane has different list view that I add depending on the user selection. As far as adding controls on runtime concerns, I dont have any problem with it. However, when I add the control at runtime and then populate the list view data, it displays a grey box until the control is filled and then docked top in the pannel. What I am thinking is to add controls on runtime using the main thread and populate the data with another thread. Will it be ok?

Thanks for the help, Nauman.

Assisted Solution

CrazyIvan007 earned 1000 total points
ID: 11943583
This will work too! The problem is the populating of the ListView which needs some time, if you let them run in a Thread the UI can build up the other Controls without waiting until the ListView is populatet.


Featured Post

Upgrade your Question Security!

Your question, your audience. Choose who sees your identity—and your question—with question security.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Article by: Najam
Having new technologies does not mean they will completely replace old components.  Recently I had to create WCF that will be called by VB6 component.  Here I will describe what steps one should follow while doing so, please feel free to post any qu…
We all know that functional code is the leg that any good program stands on when it comes right down to it, however, if your program lacks a good user interface your product may not have the appeal needed to keep your customers happy. This issue can…
In this video I will demonstrate how to set up Nine, which I now consider the best alternative email app to Touchdown.
From store locators to asset tracking and route optimization, learn how leading companies are using Google Maps APIs throughout the customer journey to increase checkout conversions, boost user engagement, and optimize order fulfillment. Powered …

624 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