Usercontrols - Loading User Controls Programatically Into A Placeholder?

Apr 15, 2010

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" AspCompat="True" %>
<%@ Register src="Modules/Content.ascx" tagname="Content" tagprefix="uc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">

But still no results unfortunately.

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Web Forms :: Finding UserControls Within A PlaceHolder Control?

Sep 28, 2010

I am having problems finding my UserControls inside the Controls collection of a Placeholder control.

I have a ListView control with a PlaceHolder control in its ItemTemplate. OnItemdataBound for the ListView control I am adding a custom UserControl to the Controls collection of the Placeholder control. It all renders fine. My problem is when I try to find my user controls in the Placeholder. I just can't get it back. My code is below.

My objective here is to get to the input controls within my UserControl and call the save method of this.

PlaceHolder intakeBenefitHolder = null;
protected void lvIntakeBenefits_ItemDataBound(object sender, ListViewItemEventArgs e)
if (e.Item.ItemType == ListViewItemType.DataItem)
using (ListViewDataItem item = (ListViewDataItem)e.Item)


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Web Forms :: Programmatically Loading UserControls With Page_load Event?

Feb 16, 2010

Programmatically Loading UserControls with Page_load Event?

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Pro-grammatically Loading UserControls with Page_load Event?

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AJAX :: ModalPopupExtender In UserControl.ascx Dynamically Loading Into Placeholder

Jul 28, 2010

if Panel have any aspnet control,panel not popups.otherwise working.whats wrong here ? is it impossible ?


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Usercontrols - Wiring Events On Dynamically-loaded User Controls?

Mar 14, 2011

For a "dashboard" module I need to dynamically load user controls based on criteria as the user enters the page (role, etc). The problem is that the events are not being fired at all from the controls

As I understand it I need to load the controls in the OnPreInit method of the dashboard page, however I cannot get a reference to the Placeholder control at this point of initialization (i.e. I get a NullReferenceException); trying to load the Placeholder dynamically via Page.FindControl gives me, ironically, a StackOverflowException.

I've tried loading the controls in PreRender and OnInit as well but the events in the controls are not wired up properly and will not fire.

The code is basically this:


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Usercontrols - Recommend Books For Developing User And Custom Controls?

Mar 13, 2010

Please recommend books for developing ASP.NET User and Custom Controls

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Maintain ViewState Of PlaceHolder / When Page Get Refresh All Controls From Placeholder Gets Removed From It?

Jan 19, 2010

how to maintain state of placeholder. i have a placeholder in which i add many image controls dynamically but when my page get refresh all controls from placeholder gets removed from it. the enableViewstate of placeholder is set to true.

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Web Forms :: Adding Controls Programatically To A Page From A User Control?

Jan 20, 2010

In a User Control, I need to add a Div to the end of its parent's page. I've done this in a number of ASPX pages, where I put the code to generate the Div and its contents in the page's PreRender event handler, and it works fine. But when I try to do the same thing in the PreRender event handler for the User Control, I get the following error:

The control collection cannot be modified during DataBind, Init, Load, PreRender or Unload phases.How do I accomplish this in a User Control?

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Forms Data Controls :: List View Item Placeholder / Error An Item Placeholder Must Be Specified On ListView 'ListView1'

Mar 22, 2011

I am using list view to display the the data but i am getting an error like An item placeholder must be specified on ListView 'ListView1'. Specify an item placeholder by setting a control's ID property to "itemPlaceholder". The item placeholder control must also specify runat="server.Even i have specified the itemplaceholder id but no use still same error.


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Usercontrols - How To Load All Assemblies In Bin To Find A User Control

Oct 25, 2010

Part of a web application we have uses an in-house web control assembly. This assembly contains several web user controls where several of these are used by other web controls within the same assembly.

The assembly is built as a website with a web deployment project.

The main web application's pages are dynamically compiled through a service into a single assembly and placed into the appropriate bin folder. In our development server the old assemblies aren't always tidied up and removed, meaning the folder gets full of old assemblies.

When the page that uses the in-house web control assembly (mentioned above) runs, the instance throws an out of memory as it loads all the old assemblies in an attempt to determine which assembly houses the reference to the user control being used by the other user control inside the same assembly.

We've been using the following inside the top level user controls to register the other controls

<%@ Register Src="~/....ascx" TagPrefix="UC" TagName="...." %>

Of course when the application runs this gives no information as to which assembly it can find it in.

Is there anyone that's come across this problem before? It's not really a problem as our live servers use a clean up tool to remove old assemblies, but there are still potential situations where we could get out of memory caused by this (for example the tool stops working!), so it would be nice to resolve this problem.

Here is the stack trace


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MVC :: Dynamically Render The Usercontrols Based On The Logged In User?

Dec 1, 2010

We have an application where the controls are dynamically added to the form based on the logged in user,

This user controls related data is stored in the database. There is lot of logic in the code behind in the webforms which is so messy to maintain it, we are planning to re-write it using the MVC framework.

I would say there would be rougly 50 different forms based on the user logged in, is it good idea to create so many views and redirect to the appropriate view based on the logged in user, in some of the forms there might be minor difference like the order of the Control might change.

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Usercontrols - How To Load Single User Control On Selection Of A Tab

Jun 14, 2010

I got 15 tabs and 15 user controls assigned to each tab.All are loading at once which id delaying the process.
I want to load one user control on selection of a tab in tab container.

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Usercontrols - How To Add A New Javascript From A User Control Loaded By Callback

Sep 10, 2010

I'm doing a menu that loads levels dynamicly, when you click on a item the next level is loaded asynchronously. For each menu item I have a user control. Every user control is declared in its parent, for example, the "secondlevelcontrol" has the reference to "thirdlevelcontrol".With this level of nesting, I want to manage the asynchronous calls on every user control so, when the first level is loaded the javascript to load the second is loaded too. When the second level is loaded the javascript to load the third is loaded too.

To do asynchronous calls I'm implementing ICallbackEventHandler interface. As you can see in the examples, controls are added to the page as plain html. The method "ProcessOnLoadEvent" executes all lines of the "OnLoad" event of the user control.An example of the implementation is this for the user control of fourth level:

public string GetCallbackResult()
return _callbackRendering;


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Usercontrols - Converting Web Form To User Control OnPreInit Event?

Feb 18, 2010

I'm in the process of converting an ASP.Net webform into a User control and there an event that now says

no suitable method found to override

the event code causing the compile error

protected override void OnPreInit(EventArgs e)
//do some stuff

Is there any equivalent for a user control?

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Security :: Programatically Get User Info In A Usercontrol?

Jun 22, 2010

In a web page,I can use the following code:


But that doens't work in a web user control. Am I missing a reference, or something?

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Web Forms :: Asynchronous Loading User Controls?

Aug 20, 2010

I have 3 user controls that I have to load at the same time. They each contain a gridview that pulls data from the database. They are doing a "delay" load of the data so there is a progress bar template that shows that the data is loading however the first gridview fires and loads, then the second, then the third and I need them to all fire at the same time.

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AJAX :: Loading Web User Controls When Using A WebService?

May 13, 2010

I'm using partial page loads off a webservice and was curious if there was a way to load a control through the .asmx file when the part loads. I tried:

Control CallDetailsControl =

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User Controls Is Very Slow In Loading Page (AJAX)

Aug 23, 2010

I have an .aspx page with multiple .ascx (User Controls on it). One of the User controls is very slow in loading (calls a very slow webservice for the data.). Now, my question is how to render all the controls on the page (so the User can view those) and have a rotating icon for this control (slow one) (till it loads). I know, I need to bring AJAX into picture, but any clarification on that would help as I will be new to AJAX programming.

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Web Forms :: Loading User Controls Inside Text?

Apr 12, 2010

I have a scenario that I cannot fit my small brain around at the moment. I have a database driven site that also has a variable amount of user controls that go on to some pages. Some pages do not have user controls associated with them).

So I'm returning the page's body text from the data base like this:

The quick brown fox %ucUserControl1.ascx% jumps over %ucUserControl2.ascx% the fence.

I'm using a text editor for the backend that I'd like to be able to specify a user control in text format (by wrapping it in some sort of tag-- % was used for my above example, but anything will work).

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Iframe Versus Dynamically Loading Web User Controls

Apr 16, 2010

I need some on techniques to perform page redirect in Which one is more recommended to use in

Dynamically changed the src of the Iframe to difference aspx.


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Dynamically Loading User Controls In C# Web Application Rather Than Website

Dec 27, 2010

I am trying to create my own website management framework similar to DNN/SiteFinity (only a mucho cut down version).

One of the big (but common) features is to be able to dynamically add user controls to provide additional functionality.

I would prefer to use a pre-compiled .NET "Web Application" over a dynamically compiled "Website".

What are the implications of using LoadControl method to dynamically add a user control for a pre-compiled web applications with specific regard to:

Session (preume I am using the stateserver)What happens to all the other users - will they be logged out?
Application pool recycling due to changes to some compilation??

I am not sure I have ever dynamically added a user control to a pre-compiled web applications as I have mainly been using "Websites" so I am making a large presumption that it will work because if the website is pre-compiled, does this mean the dynamically added user control will be dynamically compiled as required even though the site is pre-compiled?


I also forgot to mention that the user controls will be outside of the application directory and so won't be published during web deploy - they will be uploaded via another website.

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C# - Loading & Retrieving Data From Multiple User Controls?

Feb 3, 2011

I have multiple user controls on the page that are used primarily for data entry purposes. When a product is loaded, I need to load the product data into all those user controls and retrieve data when I need to save the product. The user controls are not visible to the user directly, instead user would click on a link and the user control will open up in a modal popup.

Currently the way I'm doing this is, I've loaded all the user controls on the page in separate div controls, and showing the modal popup when the link is clicked. I'm sure loading all the user controls on the page is not a good idea. Is there a better way to handle this? I think we can show the markup using JSON with jQuery - but how can I load and retrieve the data using that?

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Web Forms :: Dynamically Loading Different Numbers Of User Controls?

Nov 15, 2010

The web page I am trying to (slowly) build should allow users to add whichever user controls they want on their page, and order them whichever way they like. This is saved in a database.

So each user could have a different number of controls on the page.

This is the design code, at the minute the user controls are fixed and are not loaded dynamically. They user controls are stored in 'blocks' which look like widgets on the page and can be dragged about to different columns. For each user the layout is stored in the DB i.e. which blocks are in column 1 and which blocks in column 2 etc.

How could I change this so that it can create a 'block' div for each user control returned from the database and put the user control in that block and in the right column?


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Custom Server Controls :: Loading Web User Controls Dynamically On Postback

Mar 2, 2010

First, I would like to apologize, the search on the site wasn't working, so I don't know if I'm missing an existing post or not.

I have a web page that uses a master page file. I am using a third party control from Component One(TabStrip), the tabs are rendered as links on the final page. When a tab(link) is clicked, I need to load the appropriate web user control associated with that tab. Each web user control has its own post backs and methods. I know that I can load the controls on the "SelectionChanged" event of the TabStrip control, but then any postback created by the web user control that is loaded causes the page to refresh and the control was never loaded in viewstate. So, I tried to put my procedure of loading the web user control into the page_init method. This would work, if I could read which link was clicked on from within the page_init method. I tried using a javascript function to run "onclick" of the tabs and within it setting the value of a hidden control. I have verified that the javascript works and that the hidden control's value is getting set correctly. When I get into the page_init method, the value of the hidden control is not readable.

I'm tying to understand the page lifecycle to the fullest, but I don't see what I'm missing here. I know that I need to load the web user controls in the page_init method in order to persist the page as a whole, but how can I get which tab(link) was clicked to know which control should be loaded?

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