AJAX Issue... "Extender controls may not be registered before PreRender."

Question

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I have developed one web app. using C# , and its serving the basic purpose.But from the user point of view, needed some user friendly support.
I was wondering for any utility which could offer such basic functionality without much coding effort.I thought for using TelerikControls , but the cost was the issue..
Have support of VS2010.. Finally, thought of AJAX to serve such purposes, as have found some fruitful controls in it.. I found one of my basic purpose being solved by AJAX Dropdownlist extender..
but I have observed few issues ...

1) The page in which i have used AJAX Dropdown extender taking much time to load.
2) Getting an error, while doing Save Button click (server side). The error is :"Extender controls may not be registered before PreRender."

Need your Guidance and Support...as Am a beginner in this field.. Please help !

Thanks !

Exception Detail :

C#

System.InvalidOperationException was unhandled by user code
  Message="Extender controls may not be registered before PreRender."
  Source="System.Web.Extensions"
  StackTrace:
       at System.Web.UI.ScriptControlManager.RegisterExtenderControl[TExtenderControl](TExtenderControl extenderControl, Control targetControl)
       at System.Web.UI.ScriptManager.RegisterExtenderControl[TExtenderControl](TExtenderControl extenderControl, Control targetControl)
       at System.Web.UI.ExtenderControl.RegisterWithScriptManager()
       at System.Web.UI.ExtenderControl.OnPreRender(EventArgs e)
       at AjaxControlToolkit.ExtenderControlBase.OnPreRender(EventArgs e) in f:\TeamCity\buildAgent\work\80acd78aa4c25314\Server\AjaxControlToolkit\ExtenderBase\ExtenderControlBase.cs:line 365
       at AjaxControlToolkit.DropDownExtender.OnPreRender(EventArgs e) in f:\TeamCity\buildAgent\work\80acd78aa4c25314\Server\AjaxControlToolkit\DropDown\DropDownExtender.cs:line 157
       at System.Web.UI.Control.PreRenderRecursiveInternal()
       at System.Web.UI.Control.PreRenderRecursiveInternal()
       at System.Web.UI.Control.PreRenderRecursiveInternal()
       at System.Web.UI.Control.PreRenderRecursiveInternal()
       at System.Web.UI.Control.PreRenderRecursiveInternal()
       at System.Web.UI.Control.PreRenderRecursiveInternal()
       at System.Web.UI.Control.PreRenderRecursiveInternal()
       at System.Web.UI.Control.PreRenderRecursiveInternal()
       at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
  InnerException:

Posted 25-Feb-14 18:30pm

RACHNA CHANDRAN

Updated 25-Feb-14 19:24pm

Sampath Lokuge

v3

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RACHNA CHANDRAN 27-Feb-14 1:54am

@Sampath Lokuge :
Have incorporated these.. but still not solved.!
Thanks !

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Sampath Lokuge · Answer 1 · 2014-02-25T19:31:00

you can try to re-install AjaxControlKitTool last version

( enter :'PM> install-package AjaxControlKitTool ' in Package Manager Console)

or try to override OnInit and added the script manager.

C#

protected override void OnInit(EventArgs e)

{

base.OnInit(e);

// Register the ScriptManager

ScriptManager scriptManager = ScriptManager.GetCurrent(this.Page);

if (scriptManager == null)

{

scriptManager = new ScriptManager();

scriptManager.ID = "ScriptManager1";

scriptManager.EnablePartialRendering = true;

Controls.AddAt(0, scriptManager);

}

}

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