ScriptManager required for every page that have AJAX Extensions - ASP.NET AJAX

Q.  Which control is required for every page that have AJAX Extensions for ASP.NET?
- Published on 31 Aug 15

a. UpdatePanel
b. ScriptManager
c. ContentPanel
d. None of the above

ANSWER: ScriptManager
 
ScriptManager control is required for every page that have AJAX Extensions for ASP.NET The ScriptManager control manages the communication between the client page and the server.You can directly drag and drop this control on content page. It does not have a visual representation. It only used to manage AJAX processing. You cannot use more than one ScriptManager control on single web page.

<asp: ScriptManager ID=" ScriptManager1 " runat=" server ">
</asp: ScriptManager>

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