Ajax did not appear in browser

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VB

Ajax

Hi!
I have tried quite a bit to solve this problem. I have gone through many solutions found in the internet, but none work for me. I have tried solutions like:

• reinstall the right version of AjaxControlToolkit that compatible with my visual studio 2008


• add the
  XML

  <add assembly="AjaxControlToolkit" /> and <add assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagPrefix="cc1"/>

  in the web.config
• I have checked that my web.config does not include <xhtmlConformance mode="Legacy" />
• change my script manager to <asp:ToolkitScriptManager ID="ScriptManager1" runat="server" /> (this results an error, of course)

I already tried to open my friend's project which uses Ajax components, and it can be viewed in the browser, but when I open my project, no error occurred but the Ajax does not appear in the browser.

How can I solve this problem? Any help will be appreciated.

Thanks!