Adding Controls To Page On PreRender?

Mar 24, 2010

Do you know any drawback to add controls to a page on PreRender event?

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Similar Messages:

How To Modify Raw HTML Of Page On PreRender

May 13, 2010

I want to access the raw HTML code that my ASP.NET System.Web.UI.Page is about to render.

How can i do that? Is there a property or method like System.Web.UI.Page.HTML or something like that.

I know I could loop through the Controls List of the page and get access to all the Literal Controls etc, but I was wondering if there's a direct property or method that can return me the raw html, which I can modify just before rendering the page.

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AJAX :: PreRender Code For Control Inside Update Panel Delays Page Refresh

Mar 3, 2010

I have a control on a page. In the control's pre-render event I'm executing some code that's taking about a minute to execute. This means the whole page is unresponsive until the control's pre-render event is finished executing.I tried putting the control inside an update panel, but it doesn't matter the rest of the page still won't render until the pre-render event of the control is finished executing. I've attached a very simple example of my code (The event that's slowing up the control's pre-render event is not Thread.Sleep(1000):




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C# - Binding Controls On PreRender?

Dec 17, 2010

I have been led to believe that the best point to bind your controls is the PreRender. As all the controls are ready and this is the last stage before rendering etc. Is this correct or should controls be bound at a different point?

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Web Forms :: Extender Controls May Not Be Registered After PreRender?

Mar 8, 2011

I am creating Dynamic UserControls with Dynamic AjaxControls. Then I store each of the UserControls in a Collection. On Postback I recall the UserControls in the collection to Re-Create the interface. It works if i only use Standard HTML controls but does NOT work with AJAX controls. I get this error on PostBack Extender controls may not be registered after PreRender. So far I have tried the following:

MyBase.OnPreRender(e) in Page and Usercontrol EnsureChildControls() in the OnInit Added ScriptManager to the MasterPage None of this stuff is working... If I re-create all the controls including the ones inside the usercontrol then i get no error however it takes forever to do a postback as opposed to just recalling the collection of UserControls.

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AJAX :: Script Controls May Not Be Registered After PreRender?

Feb 3, 2011

I get this error on postback from using a dynamic created controls, specifically the
Ajax ComboBox. If I use DropDownList instead, then I don't get the error. How to over come this issue? I do need to use theAjax ComboBox because it allow extra properties not available in DropDownListHere is the complete error:Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: Script controls may not be registered after PreRender.My ToolKitScriptManager resides in the MasterPage.

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Web Forms :: Script Controls May Not Be Registered Before PreRender In Telerik?

Sep 19, 2010

I am currently trying to use Telerik. I am designing login control. But however I m getting this error :


I don't know how to resolve it, here is my Code :Aspx :


And this is C# :


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Forms Data Controls :: DetailsView - PreRender Event Bug?

Mar 7, 2010

I have a DetailsView on my page, bounded throught ObjectDS (but I think it's not important). Some field is readonly for some users - based on role membership and other paramaters. I've tried to use the PreRender event to manage these field's readonly state. Everything is working - except one template field: when I click first time on Edit button the dropdown list stay readonly independently the role membership. When I click on Cancel than Edit again the control state is good. Code of PreRender event handler:


Environment:Web Developer 2008 Express .NET Fw. 3.5 Windows XP

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Web Forms :: Dynamic Controls Example. Script Controls May Not Be Registered After PreRender?

Mar 25, 2011

When creating dynamic ajax controls you may experience a pre-render issue on postbacks. You are supposed to re-create the controls on postback, however if there are very many of them performance gets very slow between each postback. i.e. clicking on a combobox, it may take several seconds. So what I did was group the controls in panels, store the panels in a collection, then re-call the panels on Postback. This actually works great if the controls inside the panel are standard html controls (textbox, dropdowlist, etc.). But...doesn't work well with ajax controls...yet.

I have included a sample below. Uncomment/Comment the code to test it.



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Forms Data Controls :: PreRender Takes Upto 13 Seconds?

Jan 8, 2010

At the first loading of my page, duration of PreRender takes upto 13 seconds. That page has basically a gridview control which bind to SqlServer query by SqlDataSource. When I execute query seperately, it takes only 0.02 second.

On the other hand, for the next loadings of same page by postback, duration of PreRender varies from 0.5 second to 3-4 seconds.

In addition to gridview, there are several dropdownlist, update panel, ImageButton in gridview. I use paging for Gridview.

Which strategy should i follow to increase performance of this page?

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Dynamic Controls Example - Script Controls May Not Be Registered After PreRender?

Mar 25, 2011

When creating dynamic ajax controls you may experience a pre-render issue on postbacks. You are supposed to re-create the controls on postback, however if there are very many of them performance gets very slow between each postback. i.e. clicking on a combobox, it may take several seconds. So what I did was group the controls in panels, store the panels in a collection, then re-call the panels on Postback. This actually works great if the controls inside the panel are standard html controls (textbox, dropdowlist, etc.). But...doesn't work well with ajax controls...yet.

I have included a sample below. Uncomment/Comment the code to test it. If anyone has a good idea how to make this work with ajax controls that would be great.

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm1.aspx.vb" Inherits="PreRenderAjax.WebForm1" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="">
<head runat="server">
<form id="form1" runat="server">
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>

Public Class WebForm1
Inherits System.Web.UI.Page
Shared panellist As New List(Of Panel)
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If IsPostBack Then
'This is for reloading panels. Works with dropdownlist, but not ajax combobox
For Each pn As Panel In panellist
'This for re-creating all the controls again. Not very efficient for ajax controls though.
End If
End Sub
Protected Overrides Sub CreateChildControls()
End Sub
Protected Overrides Sub OnInit(ByVal e As System.EventArgs)
End Sub
Private Sub CreateInterface()
Dim pn As Panel
pn = CreatePanel("panel1")
CreateControls(pn, 5)
pn = CreatePanel("panel2")
CreateControls(pn, 5)
pn = CreatePanel("panel3")
CreateControls(pn, 5)
pn = CreatePanel("panel4")
CreateControls(pn, 5)
End Sub
Private Function CreatePanel(ByVal name As String) As Panel
Dim pn As New Panel
pn.ID = name
pn.Width = 250
pn.BorderStyle = BorderStyle.Solid
pn.BorderColor = Drawing.Color.Blue
pn.Style.Add("margin", "5px")
pn.Style.Add("padding", "5px")
CreatePanel = pn
End Function
Private Sub CreateControls(ByVal pn As Panel, ByVal howmany As Integer)
Dim cbo As AjaxControlToolkit.ComboBox
'Dim cbo As DropDownList
For i As Integer = 0 To howmany - 1
cbo = New AjaxControlToolkit.ComboBox
'cbo = New DropDownList
cbo.ID = pn.ID & "_cbo" & i
cbo.Width = 200
cbo.Items.Add("Item 1")
cbo.Items.Add("Item 2")
cbo.Items.Add("Item 3")
cbo.Items.Add("Item 4")
cbo.Items.Add("Item 5")
cbo.Style.Add("margin", "3px")
cbo.AutoPostBack = True
End Sub
End Class

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Forms Data Controls :: PreRender Content In ListView Missing In Excel Extract?

Jan 13, 2010

Whenever I try to export a ListView with formatting or dynamic content in the PreRender event to an Excel file, I lose all of the changes from the PreRender event. Here's the ListView code:

<asp:ListView ID="ListView1" DataSourceID="profileData" runat="server" DataKeyNames="ROW_NUM">
<table cellspacing="0">


I've done some reading and found that RenderControl possibly ignores anything in PreRender for a control, but I'm thinking there has to be a way to get those PreRender changes in there before extracting the ListView to Excel.

The only workaround I've found so far is to copy and paste all of my preRender code into the Page_Load, and then everything looks fine in Excel. However, then I have to duplicate my code, as I still need it in the preRender event to display it on the screen properly. I don't want to maintain the code twice.

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Forms Data Controls :: How To Save Viewstate Of Gridview After Cols / Rows Modified In PreRender

Oct 29, 2010

I have changed the look and feel of the grid by modifying the cols, rows in the gridview. I need to save this in the gridview viewsate, so that it load the modified look and feel next time it loads from the viewsate.

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AJAX :: Error - "Script Controls May Not Be Registered Before PreRender. "?

Apr 23, 2010

I am using ajax tabpanel control. and i have fileupload control, gridview inside the tabpanel.if i select the file in fileupload control and click upload button it has to read the excel file data and bind the gridview.i debugged the code the dataset has the correct values and bind method also calling successfully.
but finaly in the screen shows this error message "Script controls may not be registered before PreRender."
what is the problem.

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AJAX :: "Script Controls May Not Be Registered Before PreRender."

Jun 2, 2010

Getting following error

System.InvalidOperationException: "Script controls may not be registered before PreRender."

On my masterpage i am using Docking Panel control to get collapsable/Expandable left area.
Its working fine but when i try to place an infragistic WebExplorerBar Control inside Docking Panel to get Outlook like view. It gives the above mentioned error.

Following is the code sample.

Text="Navigation" ID="DockingPanelTree" Docking="Left" runat="server"

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Web Forms :: Adding Controls To Page?

Jul 20, 2010

I need to add some linkbuttons dynamicly to the page, this isnt a problem.

But I need to put the controls in this format :

<li> Linkbutton goes here</li>

So if I need to add 3 linkbuttons it should render like this

<li> Linkbutton1 goes here</li>
<li> Linkbutton2 goes here</li>
<li> Linkbutton3 goes here</li>

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Dynamic - Dynamically Adding Controls In Page?

Feb 20, 2010

I am adding controls dynamically in my webpage.

I add them in onload method.

everything is working fine..

But I m a bit confused about how it works..

I have read in so many articles that all controls get their values from viewstate before load event. Then how my dynamically added controls get their values when i am adding them in OnLoad event ie after LoadPostData event.

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AJAX Controls, Adding Via .ashx Page?

May 5, 2010

Okay, this is a continuation of a previous question of mine, but it is distinct enough to be its own question. Based on user interaction, I'm calling a .ashx handler via a jquery ajax call, and that handler is building some html for me that includes some Telerik controls like a masked textbox (masked for a phone number like "(###) ###-####".

I got around all the hurdles of using Render() to get the html output of a server control even when it doesn't have a "Page" object or a ScriptHandler object.However, when I show the control to a user, I see the mask in the text of the textbox, but the mask doesn't "work" in the sense that when a user starts typing, it is as if the mask is really just text.

So, my question is, after putting the html code out for a masked textbox, how do I tell whatever javascript is supposed to mask the input to really start masking on that specific control?

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Pagination - Adding Controls To Page Numbers?

Jan 12, 2010

My web app has a datalist with pagination. How can I dynamically add controls for the page numbers? For example, right now I have something like:

<asp:label id="lblPages" runat="server" />
for i = 1 to totalPages
lblPages.Text += "<a href='mypage.aspx?page=" & i & "'>" & i & "</a>"

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Pagination - Adding Controls Dynamically To The Page From Web Method?

Feb 11, 2010

I am using jquery ajax method to get data from a web method and present data using DOM(similar to that of google search results).B'coz the data returned from the web method is huge I want to paginate the results.For that I need to create buttons corresponding to the page numbers based on the no. of records the web method retrieves from the database.So I have taken a div on the page.In the web method ,as soon as I can find the number of records obtained from the database,I want to create the buttons and add to this div and display 10 records per page.As far as I know, it is not possible to access anything that is placed on the page from Web method.In that case how do I paginate the results?

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AJAX :: Dynamically Adding Controls To A Page With An Updatepanel?

Nov 14, 2010

I am dynamically adding controls to a page with an updatepanel. The controls do trigger a post back but their events do not fire.

For example:

LinkButton link =
link.Height = 45;
link.Width = 250;
link.Font.Underline =
link.Font.Bold =
link.ValidationGroup = "NoValidation";
link.Click += new

I have set a break point on the Load_Page and in the EventDoesNotFire method. The Load_Page fires, but it never enters the EverDoesNotFire method.

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Web Forms :: Adding User Controls To A Page Dynamically

Feb 6, 2010

I need to set some attributes on user controls that I'm dynamically adding to a page placeholder. Is this possible?


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What Does Prerender() Do / Finding Explanation

Jul 15, 2010

I read this


and I was wondering if there's anyone that can explain to me what Prerender should do, for example for a button or a calendar component.

I can't imagine it; can you show me few lines?

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How To Put Code Into PreRender Such As Databinding

May 19, 2010

Would a call to a database be called if you put the databind method in the PreRender event of a listbox and the listbox was rendered on the screen for example? This is a specific example regarding a listbox, but basically does code in PreRender only get called if the control is rendered on the screen. If this is so, is it good practice to put code into PreRender such as databinding?

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MVC :: PreRender The SiteMap Appear CollapseAll()?

Jul 14, 2010

I have a SiteMap in my project and I want That on the PreRender The SiteMap appear CollapseAll() but I can't do it.

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