AJAX :: Error - Two Components With The Same Id Can't Be Added To The Application

Oct 1, 2010

I am using the AJAX Control toolkit version 4.1.40412.0 in a C# web application that is using .NET 4.0.

I am programming with Visual Studio 2010. Most of the time, the AJAX Control toolkit works properly. However,

in one instance, the AJAX Toolkit generates this error message:

Microsoft JScript runtime error: Sys.InvalidOperationException: Two components with the same id

'ctl00_ContentPlaceHolder1_FormTemplateCtl7_UpdateProgress1' can't be added to the application.

The error is generated here:

function Sys$_Application$addComponent(component) {
/// <summary locid="M:J#Sys.Application.addComponent" />
/// <param name="component" type="Sys.Component"></param>
var e = Function._validateParams(arguments, [


The problem appears to be with the UpdatePanel1 object.

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