Click here to Skip to main content
13,298,481 members (66,674 online)
Click here to Skip to main content
Add your own
alternative version


60 bookmarked
Posted 27 Aug 2004

Dynamically Created Controls in ASP.NET

, 27 Aug 2004
Rate this:
Please Sign up or sign in to vote.
How to dynamically create controls in an ASP.NET page.


Adding controls to an ASP.NET WebForm at runtime is a simple task:

private void Page_Load(object sender, System.EventArgs e)
    Button newButton = new Button();
    newButton.Text = "New Button"; 
    newButton.ID = "newButton"; 
    newButton.Click += new System.EventHandler(this.newButton_Click); 

    WebUserControl1 newUserControl = 
    newUserControl.ID = "newUserControl";


Now, let's raise a bit little. What if we want to add a new control as a result of some user action (button click, for example)? We are moving the same code from Page_Load to Button_Click event and… here troubles begin. Our controls will show as expected, but only the first time. Any postback will reset the page to its original state. Dynamically created controls will be unable to fire any event. What is happening here? The answer is simple. Page class is stateless. It is destroyed after rendering. Page recreates child controls collection, based on tags in aspx file, then postback data can be handled and event handlers attached (in OnInit event). Controls we just created dynamically do not exist in aspx file; Page has no knowledge about them.


The solution is also simple. We have to recreate controls on load stage of page lifecycle. After it's done, each control can handle its postback data, retrieve saved viewstate, raise events etc.

Now, the code skeleton will look like this:

private void Page_Load(object sender, System.EventArgs e)
private void Button_Click(object sender, System.EventArgs e)
private void RecreatePersistedControls()
    // Call CreateControl for each persisted control
private void CreateControl(string id)
    // Create controll with specified id, 
    // add it to controls collection, attach event handlers
private void PersistControl(string id)
    // Persist specified id (in session for example)

Download source files to see the fully functional sample.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Leon Langleyben
Web Developer
Israel Israel
Leon works as Chief Architect at SRL Group. He leads architectural design and development of various enterprise level projects.
You can meet him on user groups, conferences and forums dedicated to Architecture, ASP.NET, Team System etc. or join him for the next white water rafting adventure

You may also be interested in...


Comments and Discussions

GeneralRe: Page Load Occurs first on Button Click Event Pin
hetauda18-Aug-06 8:00
memberhetauda18-Aug-06 8:00 
Generalabout calendar in Pin
nirav9915-Feb-05 21:02
membernirav9915-Feb-05 21:02 
Generalabout calendar in Pin
nirav9915-Feb-05 21:00
membernirav9915-Feb-05 21:00 
Generalabout calendar in Pin
nirav9915-Feb-05 20:59
membernirav9915-Feb-05 20:59 
Generalabout calendar in Pin
nirav9915-Feb-05 20:57
membernirav9915-Feb-05 20:57 
GeneralA similar approach Pin
A_Big_Newfoundland31-Aug-04 15:47
memberA_Big_Newfoundland31-Aug-04 15:47 
GeneralRe: A similar approach Pin
Leon Langleyben31-Aug-04 21:15
memberLeon Langleyben31-Aug-04 21:15 
GeneralDyanamically Created Controls Pin
PraveenTVS30-Aug-04 0:13
memberPraveenTVS30-Aug-04 0:13 
GeneralRe: Dyanamically Created Controls Pin
Leon Langleyben30-Aug-04 22:39
memberLeon Langleyben30-Aug-04 22:39 
Questionwhat about content of dynamic controls Pin
Rex_canedo28-Aug-04 15:32
memberRex_canedo28-Aug-04 15:32 
AnswerRe: what about content of dynamic controls Pin
Anonymous29-Aug-04 0:13
sussAnonymous29-Aug-04 0:13 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Praise Praise    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.

Permalink | Advertise | Privacy | Terms of Use | Mobile
Web03 | 2.8.171207.1 | Last Updated 28 Aug 2004
Article Copyright 2004 by Leon Langleyben
Everything else Copyright © CodeProject, 1999-2017
Layout: fixed | fluid