Ajax 1,0 Error

Just what it says... add the ScriptManager control.

Open your toolbox.
Add Item
Browse to the Ajax toolkit dll
This will add the controls to the toolbox. Drag on the ScriptManager control.

I have scriptManaer control in Master page already. It works fine for AJAX beta version.

ConfirmButtonExtender1

This button is inside a user control. All pages include the user control reference the master page. The master page include ScriptManager already. It should come out before the button.

there are two different ScriptManager controls potentially...

Make sure you are using the one with the extentions/toolkit you have.

Thanks. But how can I know which one I should used for?

In master page, the control tag is:

<asp:ScriptManager runat="server" ID="MasterScriptManager" EnablePartialRendering="true" ScriptMode="Release">
</asp:ScriptManager>

In Web.config, the tag defined as:

<pages>
<controls>
<add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
<add tagPrefix="ajax" namespace="AjaxControlToolkit" assembly="AjaxControlToolkit"/>
</controls>
</pages>

The referenced assemblies are:

AJAXExtensionsToolbox.dll
AjaxControlToolkit.dll
System.Web.Extensions.dll
System.Web.Extensions.Design.dll
BuildVsi.dll

After compilation, VS add 2 assemblies:

Microsoft.Web.Extensions.Design.dll
Microsoft.Web.Extensions.dll

I can not removed them from bin folder