AJAX control to manage JavaScript files sent for communication between client and server - ScriptManager

Q.  Which control is required of every AJAX page to manage the JavaScript files sent to the client and the communication between client and server?
- Published on 16 Jun 15

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

ANSWER: ScriptManager
 
ScriptManager control is mandatory control if you want to work with ASP.NET AJAX server control. Only one instance of a ScriptManager can be added to the web page. It manages the JavaScript files sent to the client and the communication between the server and the client. It also manages partial-page updates. The HTML for a ScriptManager control in Source view looks as follows:

< asp:UpdatePanel ID="UpdatePanel1" runat="server">

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