ModalPopupExtender Example


Let’s make a nice see thru background:


The position should be -1000px, so during loading you not gonna see popup initialization.

    border: solid1px#c0c0c0;
    padding: 0px10px10px10px;


<ajaxToolkit:ModalPopupExtender ID="ModalPopupExtender1" runat="server"
<asp:Panel ID="panEdit" runat="server" Height="180px" Width="400px" CssClass="ModalWindow">
    <table width="100%">
        <td class="formtext" style="height: 23px; width: 150px;" align="left">
            <asp:TextBox ID="txtFields1" runat="server"></asp:TextBox>
    <br />
    <asp:Button ID="Button1" runat="server" Text="Update" OnClick="btnUpdate_Click"/>
    <asp:Button ID="btnCancel" runat="server" Text="Cancel" />
<a id="lnkPopup" runat="server">Show Popup</a>
Posted on March 17, 2008 by


Posted on 11/21/2008 12:53:17 AM by manish nagar

ya its working in mozzila bt its useless for the IE 6.0 can u tell me how i set the position center of modalpopup in IE 6.0


It should work in IE 6.0 as well. You probably have modalpopup panel in some kind of div container, which has style position equal to absolute or relative.

Posted on 8/20/2009 01:43:22 AM by BP


Posted on 8/28/2009 12:22:48 PM by Rodrigo

Muito bom mesmo eu sou do Brasil e estava procurando um exemplo destes me esclareceu tudo que precisava. Very Good

Best Regards

I glad that I can help.

Posted on 10/6/2009 06:09:05 AM by bodhi

it good

Posted on 10/15/2009 11:33:27 PM by om

Really very nice … because you didnt explained in words but showed in ur code. thank u very much.

Suggestion : Create one blog and give tutorial, even u can get a little money. bcause it is such good

Posted on 10/28/2009 06:26:23 AM by Vanclei

Nice, up and running :)

That’s the beauty of the internet, information is everywhere, thank you

Vanclei Matheus - Brazil

Posted on 1/10/2010 08:56:43 PM by Joe

Useless code, what the TargetControlID=“lnkPopup” was not included? How is anyone suppose to know what is that?
You are right. I added missing code. Thank you for noticing.

Posted on 3/12/2010 10:48:44 PM by bhimji mendaparara

i want to know abourt behaviourid about popup exterdor
Behaviorid is a name of javascript variable for popup. Using this variable you can access corresponding javascript object.

Posted on 4/29/2010 10:33:17 PM by Hemant Ghiya

Ya its nice budyy.. Its working fine. Thanks

Posted on 6/17/2010 01:47:55 AM by mbanx

thanx for the sample.

but i fail to try it.

can you give the complete code or the file

Posted on 6/24/2010 12:53:39 AM by priyanka

i am using modal pop up extender but its showing j script error..do solve it.
What kind of error? Get Firefox and Firebug, it would help.

Posted on 6/25/2010 01:29:29 AM by Madhusudhan

I have a Modalpopupext control out side the repeater control. I have a button in repeater control. I am calling javascript function showmodalpopup() by using OnClientClick event of the button. It’s working nice in IE but it’s not showing in the Mozilla. Why

If any one knows why, please let me know the answer

Do you have Firebug installed? Do you see any javascript errors? Make sure that your OnClientClick function return false, so no post back happens.

Do something like this OnClientClick=“ShowPopup();return false;”

Posted on 9/13/2010 06:08:27 AM by robert

its doesnt work, position absolute -1000 doesnt change after popup is shown

Posted on 9/13/2010 06:10:02 AM by rrr

try to download latest version of ajaxcontroltoolkit, position absolute top - 1000 never will work

Posted on 10/23/2010 06:20:36 AM by jatin

hi i want to use .aspx page as a modal window .how should i do it.
Put it in iframe and then use it with ModalPopupExtender.

Posted on 12/16/2010 12:01:16 AM by asplearning

Excuse me. What does “OnClick=“btnUpdate_Click” mean? I can’t fine btnUpdate in your code. Did I miss something? Just want to understand what it does. Thank you. Great post.
btnUpdate_Click is code behind event for button btnUpdate (aspx.cs or aspx.vb file).

Posted on 12/22/2010 12:08:07 PM by e f bolton

very helpful! much thxs 4 posting!!

Posted on 12/23/2010 03:48:15 AM by Muhammad.Jaelano

I’m Sorry ,

I want to ask you

how to make multiple modal popup in one modal popup

I don’t think that this is possible. It goes against modal popups nature :-). It’s like asking “Can I have two singeltons?”.

Posted on 1/9/2011 02:16:40 PM by Carlos


thanks for your post, it’s really helpfull. But I have a problem with this part of the CSS code:



Filter and Opacity don’t work in my project, I don’t know what is happening? Please could you say what is wrong with it?

On the file css I see a message wich says “is not a name’s property CSS known”

It works. It just doesn’t pass Visual Studio validation. It is not a standard CSS. It is a hack to support certain browsers. Browser that doesn’t support it would ignore it.

Posted on 2/2/2011 06:41:05 AM by Marcelo Rivera


It worked fine but when I click the update button it doesn’t raise de event.

Any idea ???

Thanks a lot.

Does it do postback? Do you have button event handler?

Posted on 2/25/2011 06:22:51 PM by Robert

Thanks for the code. My problem is the code behind. I cannot get the data from the textbox without looking at the view source for the the controlid. Can I get that dynamically?

Posted on 3/9/2011 09:19:19 AM by Sanjay

Hi.. Thank you for the example. I have a question:

I have a button at the bottom of the page…[scroll down the window] When i click it the ModalPopup opens the panel [but at the bottom of the screen], Can i make it scroll to the top of the page, i donot mean Manual scrolling, but When the popup appears it should appear at the top automatically. Is this possible?

You can specify Y parameter of ModalPopupExtender for vertical position.

Posted on 3/19/2011 06:34:27 AM by Elham

Awesome! Works like a charm! Thank you!

Posted on 3/21/2011 07:50:22 AM by Amr Hilmy

I installed the Ajax Tool Kit to my VS 2008, am trying to use the controls as shown above but am getting a wired error saying that Unknown server tag ‘ajaxToolKit:…. so please guys let me know what i haven’t done yet to get use of them .. thank you
You need to add control reference tag at the top of your page. Try drag and drop control from toolbox, it should add reference code automatically.

Posted on 3/27/2011 12:13:06 PM by Kim

Thanks for the code. The popup works great! However, my pop up is not a true modal. I can still click the buttons behind. Is this normal? Seems to be ignoring the css file. I do have the css file linked as other controls are finding it. Any ideas?
It should not be a css problem. Other controls are usually blocked by div. CSS controls how this div is looked like (opacity, color). Use FireBug to see if controls are blocked by overlay div.

Posted on 4/8/2011 09:51:14 AM by jeff

I have a dropdown box on a aspx page. If the user select a certain value I need the box to popup and ask for more info. Is there away to do this with the modalpopup?

Sure there is a way. You need to specify behaviorid of your ModalPopupExtender and then:


Posted on 4/14/2011 04:44:43 AM by Naresh

code does not work what is cause behind please help
What framework you are using? What error you are getting?

Posted on 4/15/2011 11:35:28 AM by fernando

I have the next problem, the panel in debug mode works perfectly, but when i publish the site it doesn’t show the vertical scrollbar. if you can help me i’ll be greatfull. thanks for your atention.
You said you published it. What is a link?

Posted on 4/20/2011 11:52:49 AM by fernando

It’s a popup window where you can choose one (of various) option. And i’m talking about diferencies between the published site and debug mode in VisualStudio2008 (both opened with Internet Explorer 7). I have a print screen if it can help to specify my description. Thanks for your atention and excuse me for my bad spelling
It should not produce different results. The difference between two modes is in produced DLLs. Debug version has debug symbols in them, published do not. Install IE Developer tools and see if you can track issue from there. It is probably some style issue.

Posted on 5/3/2011 09:19:43 AM by alexa

thanks for your information…

Posted on 5/5/2011 02:32:43 AM by Vichee

Even though i have kept drag=false,modal popup can be move anywhere.What i can do to prevent this?Please help me..
Correct syntax is Drag=“false”, also try to remove PopupDragHandleControlID attribute.

Posted on 5/7/2011 01:29:08 AM by lin


I’m trying to use the Extender, I want to call from my page to another page and I want it to open in the Popup, everything is ok untill the post back.. I have DropDown list in my page that you can see in the Pop Up, and when I select any value I’m doing post back, and after that my page (that I saw in the Popup) disappear.. any ideas???

In your Page_Load event check if it is post back (isPostBack page property) and if it is post back do YourPopupExternderVariable.Show().

Posted on 5/17/2011 11:09:20 AM by Ddk

Hi there, I also have a question. How to make modal popup window to be fixed on the page, and not on the screen? For example, when I move the scroll of browser window, I want modal popup to be fixed and not to move together with the scroll?

I have only .dll file, and I can not access ModalPopupExtender.cs and ModalPopupExtender.js.



This is contradicts to definition of modal popup. As far as I know it is not possible.

Posted on 5/17/2011 10:04:02 PM by NLV

How to show the popup on some condition. Take this example as an instance - I’ve an edit form where users can enter data and save and edit it if they want. If I user tries to edit an entry and after he edits the data and tries to close it without saving it I want to show the popup asking whether to save the changes. So I do the check in the server side whether the user has edited it. But how can I show the popup only on that condition?

Posted on 6/30/2011 02:23:51 AM by awedfeaf

thanks yaar it is realyhelpful

Posted on 7/17/2011 05:00:53 AM by Mahammad Rafi

With the code what you placed on site,can I put a autocompleteextender.for dropdownchanging Model popup is disappering

My Error Is Microsoft JScript runtime error: ’this._backgroundElement.style’ is null or not an object

Posted on 8/2/2011 11:06:18 PM by Bang Rock


Thank u very much

Posted on 8/23/2011 01:17:11 PM by Bob

I’m trying to set the popup panel height and width using the style= In IE it works fine in FF it does not size the panel properly. The style code is:

Style=“display: none; height:590px; width:800px; overflow:auto” but it just a small box in the middle of the page. Any help would be great.

You are lucky. Usually it is opposite. Use Firebug to investigate your issue. If it is available publicly somewhere then I can help.

Posted on 8/30/2011 02:39:13 AM by Durga


I used Modal popup extender in a Usercontrol and I used the usercontrol in many aspx pages. The extender’s visibility is restricted in javascript ie when the extender should be shown but the extender is appearing and hiding(just a blink) for some other actions like a button click and when clicking on a Menu in the aspx page. Need help to fix this.


This part of css suppose to fix this:


Posted on 9/17/2011 08:04:40 AM by Jimbo


I never see the modal popup panel. The code is executing because the existing page has the modal background style applied and is not accessible. I’ve tried every positioning, display, & z-index combination I can think of. All I ever get is the opaque background and an inaccessible page. Never a popup. Please help!

Posted on 9/29/2011 11:53:42 PM by Annuja

Update button click doesnt fire. what can i do

i need two buttons Try again and skip. If processing of some records fail then i want to show this popup. If user clicks Try again i want to process those records again and if Skip then continue with next set of records

can you please tell me how do i tap values of Try again and Skip

Posted on 11/12/2011 06:39:15 AM by Vinay Kumar Gupta

Thanks for All members

Posted on 12/8/2011 10:08:43 PM by shalini

i am adding data from pop extender but it’s not working
Can you give more details?

Posted on 12/13/2011 01:08:24 AM by Sakvith

Not a Good Tutorial. IMHO Sorry

Posted on 12/19/2011 08:46:08 AM by steve

thanks for simple easy to understand code - although there’s a lot of info available examples like this aren’t easy to find

Posted on 2/2/2012 09:33:41 AM by helen


is that possible we can put maximum button(icon)/minimum button on the top right corner of the panel? and how to set their position in code behind? much appreciated help in advance

No it is not possible. ModalPopupExtender serves different purpose. You want some kind of MDI windows interface. Look at ExtJS libraries for this.

Posted on 2/12/2012 12:27:16 AM by karpach

many errors pls remove this code

Posted on 5/16/2012 09:47:00 PM by sravan


i want to use two modal popup extenders in same asp.net page.how to use?

Posted on 8/31/2012 04:02:54 AM by Darren

Hey there. Thanks for the amazing example.

Unfortunately, I am still seeing the ‘popup initialization’ on startup. Is there another way to fix this?

Posted on 10/15/2012 05:24:48 AM by muthu

remove PopupDragHandleControlID=“panEdit”

Posted on 12/19/2012 03:28:37 AM by Ranjan

thanks for your post it is really helpful for me..

Posted on 4/8/2013 06:05:19 AM by Carlos

created 7 modalpopupextenders with the lnkPopups in a ul in a small test project and all works as desired. Moved everything to my full site using a master page and now it display all 7 extenders all the time. Developing in VS2012 Ultimate with Update 2 on Windows 7. Any sugestions???

Posted on 5/29/2013 03:25:58 PM by manoj

hai,i have one doubt for using modal popup window in the list item of dropdownlist..ie..i have one dropdown which get the value from db..whenever i select the dropdownlist items i want to show modal popup window for each item in dropdown for eg i have 5 values in db that should be shown in runtime..if i select a means it should open one popup window for instructions regarding a like this for remaiming values in dropdown..can u give me a solution for this..my mail-id: manosekar18@gmail.com