Develop Reference

Is there the event that triggered after all Control_Prerender events

I need to construct and show a notification if some errors happen in page life cycle.
Usually, I use Page_PreRender event for last changes but there are also many Control_PreRender events which called after Page_PreRender.
Is there the event that triggered after all Control_PreRender events that can be used to construct and show a notification?
Or if I find and use the latest Control_PreRender event, is guaranted that the order of all Control_PreRender events will stay the same?

based on this link Technically PreRender is your last chance to tweak the page or control before it turns into HTML stream. another alternative you can use jquery document ready to show your notification.
$( document ).ready(function() {
// Handler for show notification
// can by via ajax or just common javascript
});

prevent the page to post back on button click while event will work

I have written a code in VB.NET in which there are around 300 asp controls and all of them are creating dynamically with more than 6 condition per control (like If control = dropdownlist then some code Elseif control = radiobuttonlist then some other code).
Now I want to write events for some controls but due to postback, when event is fired all of the controls are getting flushed.
When I set button1.onclientclick="return false" for button, the page stopped post back but the event also stopped working.
I have an option to save the values of controls in view state then recreating the controls and then refill the values to dynamic controls. This option will increase my line of execution.
Is there any other method though which I can prevent the page to post back on asp control event so that my asp control persists with entered values in it and also my event will work.
this is the Code1
this is the Code2

Create your dynamic controls OnPreInit Event of Page, Hope this solves your problem
override protected void OnPreInit(EventArgs e)
{
CreateDynamicControls();//Function which creates all dynamic controls
}

I have used JavaScript and Ajax to achieve my requirement.
I have called JS function for button's onclick and Textbox's onchange (like: btn1.Attribute.Add("onClick",JSFunction(); return false;) [return false is to prevent postback].
Then I used ajax post method to do my stuff on .vb page.

How to call a full postback after the execution of the button click event inside an user control?

Okay,
I have this scenario:
There is a user control with an update panel within it. There is a button within that update panel with proper postback trigger being set. The button_click event is also defined well. I need to call a full postback of the parent aspx page once the "button_click" event is completed. Under ideal case, all the form submission events such as postbacks occur before event based methods are executed. This means my page will first be reloaded then the button click event will be executed. I want something like to reverse this operation. First Button_click event execution then one postback after that on the aspx page(this page calls the user control-> and this user control has the updatepanel with button in it).
Any possible way out would be highly appreciated.

I don't think there's a way to change ASP.NET's lifecycle, like the one you described. A (dirty) way of postbacking the parent page is however to put a hidden button on that page, and call it via javascript in the UC. (via ScriptManager.RegisterStartupScript)

Click event doesn't fire in UpdatePanel even with IsPostBack check

I'm developing simple WebForms application, where I'm trying to catch simple click event of Button ASP.NET Control from the UpdatePanel.
Button wasn't added in MarkUp part of project. It was added dynamically from the CodeBehind and also event was added dynamically too to the static class.
Here is code:
http://ideone.com/bnntkb (CodeBehind only, because MarkUp holds just only the ScriptManager and UpdatePanel controls ).
First of all, I think the issue related to the Page.IsPostback and I have tried to use:
if (Page.IsPostBack) PageSetup();
But nothing happens, it just not firing the .Click event either.
Why do I have such a problem and how to fix it?
Thanks!

Please see what happens when you put PageSetup() into the Page Init procedure. Dynamically created controls are supposed to be created there.
Maybe some UpdatePanel initialization takes place earlier in the Page Life Cycle.
Also, dynamically created controls must be created each time the Page is created, even in PostBacks.

updating updatepanel's based on texbox focus lost in asp.net

I have an asp.net page with two user controls. Each of which are in separate updatepanel's One user control has three textboxes. I want to update the second updatepanel based on change of text/ focus out in first user control. How can I access both user control's textboxes, and other controls in page and update the updatepanel on change of text ?
updatepanel1
user control1
textbox1
textbox2
textbox3
updatepane2
usercontrol2
label1
Regards,
Asif Hameed

Whoa, UpdatePanels! That takes me back. Triggering UpdatePanels to "postback" asynchronously from the client has always been a bit of a kludge. The common way was to register an AsyncPostBackTrigger with a hidden button's click event and then explicitly call its click event on the client side. However, a solution with a few less layers of indirection is to call the ASP.NET AJAX library's __doPostback() JS function.
Assuming you're using jQuery (which may be far-fetched considering you're still using UpdatePanels!), you can add an event handler to the 'focusout' event of your UserControl1 to trigger the asynchronous postback of your UpdatePanel2. I would recommend putting this JS outside of one of your UpdatePanels.
$('#userControl1').on('focusout', function() {
__doPostback('UpdatePanel2UniqueId', '');
});
I dug up a good article that explains the technique of using __doPostback in a bit more detail.
Easily refresh an UpdatePanel, using JavaScript