Gets a value that indicates whether the UpdatePanel control is being updated as a result of an asynchronous postback.
Assembly: System.Web.Extensions (in System.Web.Extensions.dll)
The property is intended for use by control developers who want to know when an UpdatePanel control is being updated as a result of an asynchronous postback. In page development scenarios, use the IsInAsyncPostBack property to determine whether a page is processing as a result of an asynchronous postback.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.