Timer control causing error

Posted on 16th Feb 2014 07:03 pm by admin

I recently decided to add a timer control to an existing page that uses AJAX on my site. As soon as I added the timer control and ran my app, I started getting the following error:Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

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

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:

[InvalidOperationException: Script controls may not be registered before PreRender.]
System.Web.UI.ScriptControlManager.RegisterScriptControl(TScriptControl scriptControl) +236
System.Web.UI.Timer.OnPreRender(EventArgs e) +75
System.Web.UI.Control.PreRenderRecursiveInternal() +77
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1360
I've been using AJAX on this page for months. Why is this timer control suddenly causing me to get a control validation error? Chopped down version of the front end code:1 2 3 4 5 6 The error occurs on page load. I don't get any compilation errors. Any thoughts?

Your Answer:

Login to answer

Other forums

Error querying database.
I get the above error when trying to insert some values to a datatable.
Here's the code :

Help With Showing Users On the Index Page
Ive got this code which works just how i want it to.

Code: <?
$timenow=time();

Multiple Pages
Hi. Im very new to php. I'm trying to create a basic login/registration page.

So I have a bas

Security Exception on pages using AJAX
I am getting the exception: attempted to perform an operation not allowed by the security policy on

disabling a button server-side then re-enabling client-side breaks button postback
I have a tabbed container and a button (not in the container) on a page. If the first tab is selecte

* Gridview and Detailsview in UpdatePanel, insert mode problem
I have a GridView and DetailsView working together. When a record from Gridview is selected, Detail

Storing Values taken from a DB...
Using this code it will generate a short list from my database

<?php
mysql_connect

Simple Variable Question
Hi everyone.... again,

I am really getting into php still. Learning more every day. I love it

Get word number x from string?
How can I use a function to loop through a string, and "have a look at" every word in the

Parse Error
Hi Guys,

I have a function in my class which returns a string link variable. The problem is i