ScriptManager control on a page  is used to enable the Microsoft Ajax features of ASP.NET:
  • Client-script functionality of the Microsoft Ajax Library,

  • Partial-page rendering, which enables portions of page to be independently refreshed without a postback.  UpdatePanel, UpdateProgress, and Timer controls require a ScriptManager control in order to support partial-page rendering.

  • JavaScript proxy classes for Web services, which enable you to use client script to access Web services and specially marked methods in ASP.NET pages. It does this by exposing the Web services and page methods as strongly typed objects.

  • JavaScript classes to access ASP.NET authentication, profile, and roles application services.

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