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Which are the major ASP.NET Ajax Server Controls?

  •  Timer: This control is used to refresh the contents of a web page at already specified intervals of time. 
  •  Script Manager: This is the heart of an AJAX enabled web page. To develop the partial page rendering, it is necessary to set the EnablePartialRendering property of the ScriptManager control to true. 
  •  ScriptManagerProxy: A ScriptManagerProxy control passes references to a ScriptManager control in a master page to declare the Ajax behavior. 
  •  UpdateProgress: This control is required to display the progress when an update action in partial page rendering process is in progress. 
  •  UpdatePanel :- Update panel is required to create partial page updates in an Ajax enabled web page. All the controls which we need to involve in partial page update we need to include them inside an UpdatePanel control.