role of script manager in asp.net page

what script manage开发者_JAVA百科r exactly do in the asp.net page.

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"Manages ASP.NET Ajax script libraries and script files, partial-page rendering, and client proxy class generation for Web and application services." - MSDN

Also you can check this MSDN Magazine article for a good reading.

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ScriptManager Class - Manages ASP.NET Ajax script libraries and script files, partial-page rendering, and client proxy class generation for Web and application services.