ASP.NET ‘Sys.Extended.UI’ is null or not an object error using AjaxControlToolkit

To resolve this issue simply add CombineScripts=”false” to the AjaxToolkitManager tag,

<asp:ToolkitScriptManager ID=”ToolkitScriptManager1″ runat=”server” CombineScripts=”false” ></asp:ToolkitScriptManager>

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About irtazaali
Project Manager, Application Developer, and Technical Consultant in a wide variety of business applications. Particularly interested in project and product development using C#.NET, ASP.NET, XAML, Visual Basic with datastores like XML, SQL Server, Oracle, and MySQL. Have 15 years experience in commercial software product development. Quite knowledgeable in ROI and infrastructure development operations. Hold MCSD.NET, OCP, and OCA certifications.

13 Responses to ASP.NET ‘Sys.Extended.UI’ is null or not an object error using AjaxControlToolkit

  1. luisrgg says:

    thnks a lot !!!, very helpfull…

  2. adriaanvanheerden says:

    After spending my entire Saterday reading 100’s of articles trying to fix this issue I was sure this easy fix wasnt going to work, but it did!!! Thanks a mil!!!!!

  3. natrajme says:

    Thanks a lot for this fix. I spend whole day searching for this kind of fix

  4. jsk4125 says:

    Hi, I know this is old, but I believe it’s
    Thanks for the help, though. Can be a little difficult when it’s in one .ascx, and you can’t find the containing page’s ‘ScriptManager’ tag. (You can only have one or the other.)

  5. spending all my reading articles , and that was just it ? guys should publish it every where .

  6. Non Sense says:


  7. Chiming in to say thanks – and hopefully get you up in Google’s search results by an inch or two ;)

  8. Great buddy…. your solution awesome ….. thanks lot

  9. sabiha khan says:

    I am also facing same issue but i am using ScriptManager,
    please let me where should i have to add the CombineScripts property

  10. Manikandan R says:

    Thanks a lot.. You saved my day :)

  11. @sabiha khan you need to use ToolkitScriptManager not ScriptManager in your design page.Then right click for properties you will find CombineScripts property.

  12. CombineScripts=”false” This one solve my problem,,Thanks a lot..

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