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Validation for Ajax Combobox control

Posted By:      Posted Date: October 26, 2010    Points: 0   Category :ASP.Net

for Ajax Combobox controls validation is not working.

Please help me out with quick solution 


Thank you




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ajax control toolkit combobox produces an error 800a025e


I have a ajax combobox in my page, when i try to select an item from it i can select by typing in text and its selectedindexchanged event fires, but when that event is complete and when i try to select another item from the combobox it produces the following error:

could not complete operation due to error 800a025e

and an alert asks me if i want to debug it.If I press yes then i get this page:

// Name:        AjaxControlToolkit.ComboBox.ComboBox.debug.js
// Assembly:    AjaxControlToolkit
// Version:     3.0.30930.28736
// FileVersion: 3.0.30930.0
/// <reference name="MicrosoftAjax.js"/>

htmlfile: Could not complete the operation due to error 800a025e.

_setTextSelectionRange: function(textBox, selectionStart, selectionEnd) {

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No combobox ajax control visible in Visual Studio 2008 web project


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New user to Visual Studio 2008 - one of the reasons for upgrading from 2005 was because I wanted to use the AJAX Toolbox Control for combobox in my web forms. 

Have started a new project, have told it to use .net 3.5 for the project, but when I go to the ajax tooklkit in the toolbox panel there is no combobox.  Could someone please tell me why it isn't there?

Environment - Visual Studio 2008 SP1

Many thanks - OfficeWonk


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i'm using visual web developer 2008 express edition

i downloaded AjaxControlToolkit.Binary.NET35 from codeplex site.

i extracted the zip file.

I added the toolbox to visual web developer by adding a new tab naming it ajax kit.

added tools to it by choose item and selected AjaxControlToolkit.dll ,the one i unzipped.

AJAX tools appear in toolbox.Even after using script manager tool,when i drag one of the contols for example autocompleteextender,i get a circle with black diagonal line indicating i cant use the tool

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when i hard code the the controls in tags in source tab ,i dont get an error but i dont get the tool in design view...

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