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Dynamically Loading User Control on a Webform using PlaceHolder control

, 5 Aug 2004
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Dynamically loading a User Control on a webform using PlaceHolder control.

Introduction

In this article, I will explain how to load UserControls programmatically on your webform. First, drag and drop a PlaceHolder control on your webform on which you will load the actual UserControl.

Adding Directive on a Webform

First, you need to add a directive on a webform telling the webform that you are going to dynamically load the usercontrol. So in the webform, add the following directive:

<%@ Reference Control = "WebUserControl1.ascx" %>

Once this directive has place, you need to load the actual control in the webform. You can load the control anywhere in the form. A good place will be the Page_Init event. In the example, I have loaded the control in the Page_Load event.

if(!Page.IsPostBack) 
{ 
    WebUserControl1 uc = 
      (WebUserControl1) Page.LoadControl("WebUserControl1.ascx"); 
    PlaceHolder1.Controls.Add(uc); 
}

Here in the code, WebUserControl1 is the name of the UserControl class through which we have created an instance namely "uc". The Page.LoadControl loads the control on the page. And finally the place holder control adds the control to its collection and displays it on the webform.

Conclusion

You can always use drag and drop features of the usercontrol to include it on the page. But sometimes it's important to load when some event occurs in the application, and for that you can create the controls dynamically.

License

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About the Author

azamsharp
Web Developer
United States United States
I am the founder of knowledge base website, HighOnCoding, GridViewGuy, RefactorCode.com and ScreencastADay.com.
 
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Comments and Discussions

 
GeneralMy vote of 5 Pinmembereshaq21-Nov-13 13:58 
GeneralMy vote of 1 Pinmemberii_noname_ii25-Mar-13 2:08 
QuestionSet "ID" PinmemberHossein Montazeri4-May-12 20:23 
GeneralMy vote of 5 Pinmemberwmtimka12-Apr-12 11:11 
Questionmain page getting refreshed Pinmemberpraveenkumar palla23-Feb-11 19:19 
GeneralDoesn't Work Pinmembershauncollege7-Jan-11 4:48 
GeneralMy vote of 1 PinmemberHoward Richards6-Nov-10 1:28 
GeneralMy vote of 1 Pinmemberavin0379-Aug-10 2:50 
GeneralMy vote of 2 PinmemberRyan Leeder21-Jun-10 20:20 
GeneralMy vote of 1 Pinmembermynkow18-Mar-10 6:29 
Generaldynamically loading usercontrol Pinmembersifad12-Jun-09 8:56 
GeneralUse jQuery Pinmembersjmueller22-Dec-08 21:35 
GeneralSolution to PostBack unload issue PinmemberDaniel Saidi15-Jul-08 6:21 
GeneralPoor PinmemberAntónio Barroso20-Sep-07 20:29 
GeneralRe: Poor PinmemberMember 368254825-Feb-09 12:26 
QuestionThen... what happens with the evens inside the user control? Pinmemberjbmixed10-Mar-07 1:33 
GeneralApu explains how to make a squishy... Pinmemberlexodus6-Mar-07 6:36 
Questioncontrol loaded twice into one placeholder in asp.net 2.0 PinmemberPongsuriya15-Aug-06 17:12 
AnswerRe: control loaded twice into one placeholder in asp.net 2.0 PinmemberAlexander Marinov12-Oct-07 4:22 
GeneralNot Dynamic ... PinmemberWaleedS13-May-06 23:37 
GeneralRe: Not Dynamic ... Pinmemberenteng.kabisote14-Nov-06 16:08 
GeneralRe: Not Dynamic ... PinmemberBanaan_12317-Dec-06 22:13 
GeneralRe: Not Dynamic ... Pinmembersmithersgs25-Jan-07 5:24 
GeneralRe: Not Dynamic ... PinmemberRitesh Totlani20-Aug-10 1:05 
Generalload a control without a reference Pinmembercipcipcode14-Feb-06 6:57 
GeneralHowto: load a control without a reference PinmemberJon-W21-Mar-07 5:13 
QuestionWhat's next? Showing how to add two numbers? PinsussAnonymous7-Mar-05 14:34 
AnswerRe: What's next? Showing how to add two numbers? Pinmembereliakaris22-Apr-05 13:39 
AnswerRe: What's next? Showing how to add two numbers? PinmemberJason Webb2-May-05 16:14 
GeneralRe: What's next? Showing how to add two numbers? PinsussSRL126-May-05 10:15 
GeneralI found this helpful. Pinmembereddie122087-Jun-05 6:49 
GeneralRe: What's next? Showing how to add two numbers? PinmemberKarell24-Nov-05 9:32 
GeneralRe: What's next? Showing how to add two numbers? PinmemberJason Webb24-Nov-05 16:00 
GeneralRe: What's next? Showing how to add two numbers? PinmemberIndirection17-Mar-06 7:52 
GeneralRe: What's next? Showing how to add two numbers? Pinmembergranig30-Jan-07 6:33 

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