Method not found at Void System.Web.UI.ScriptManager.RegisterStartupScript

Introduction

When i Deploy a running web application from one windows 2003 server to another windows 2003 server. The application is running asp.net 2.0 framework with Ajax.net v1, MSSQL 2005.After deploy everything and run the application, Error message,

Method not found: Void System.Web.UI.ScriptManager.RegisterStartupScript(System.Web.UI.Page, System.Type, System.String, System.String, Boolean)

Situation

In the bin folder, we deploy together with
AjaxControlToolkit.dll
AjaxControlToolkit.pdb
System.Web.Extensions.Design.dll
System.Web.Extensions.dll

After look around and found that the server already installed with the same version but the strange thing is the file size are different from the one i have in bin folder. The first thing can thought of is reinstall the ajax.net.

No luck, after the ajax.net reinstallation, it's not work. Still the same error message:

Method not found: Void System.Web.UI.ScriptManager.RegisterStartupScript(System.Web.UI.Page, System.Type, System.String, System.String, Boolean)

Steps to resolve

Try to delete all 4 dlls,

AjaxControlToolkit.dll
AjaxControlToolkit.pdb
System.Web.Extensions.Design.dll
System.Web.Extensions.dll

from the bin folder but still same error show. So, i undo the deletion.

Try to google around and look for useful suggestion but no luck. All post stated that working after the ajax.net re installation.

Solution

Finally, i uninstall the ajax.net from the server and let the application use the 4 dlls

AjaxControlToolkit.dll
AjaxControlToolkit.pdb
System.Web.Extensions.Design.dll
System.Web.Extensions.dll
in the bin files.

It solve my problem.Hope this sharing helps.