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ScriptManager.IsInAsyncPostBack Property

Gets a value that indicates whether the current postback is being executed in partial-rendering mode.

Namespace:  System.Web.UI
Assembly:  System.Web.Extensions (in System.Web.Extensions.dll)

[BrowsableAttribute(false)]
public bool IsInAsyncPostBack { get; }

Property Value

Type: System.Boolean
true if the current postback is executing in partial-rendering mode; otherwise, false.

Use the IsInAsyncPostBack property in combination with the IsPostBack property to distinguish between the initial page load, a partial-page update, and a full-page update in Load, InitComplete, or PreRender events.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

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.

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