Assembly: System.Web (in system.web.dll)
Classes that implement the ICallbackContainer interface provide controls with a script that will initiate a callback to the server. A callback differs from the more common postback in that the page processing for the callback recreates the page without changing state information held by the page. For more information on creating callbacks, see Implementing Client Callbacks Without Postbacks in ASP.NET Web Pages.
Classes that implement the ICallbackContainer interface should also implement the ICallbackEventHandler interface to handle the events raised by controls.
Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.