ASP.Net Error: The type System.Web.UI.ExtenderControl is defined in an assembly that is not referenced

Question

I am getting following errorThe type SystemWebUIExtenderControl is defined in an assembly that is not referenced You must add a reference to assembly SystemWebExtensions Version4000 Cultureneutral PublicKeyToken31bf3856ad364e35 How to solve this issue

dharmendr · Accepted Answer

Referhttpsforumsaspnett1291963aspxSystemWebUIExtenderControlMissinghttpsstackoverflowcomquestions20657982ajaxcontroltoolkitcompileerroraspnet

dharmendr · Answer

Refer below linkhttpswwwsitefinitycomdevelopernetworkforumsbugsissuesreferencetoassemblysystemwebextensionsversion4000

ASP.Net Error: The type System.Web.UI.ExtenderControl is defined in an assembly that is not referenced

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