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Page.AsyncMode Property

This API supports the .NET Framework infrastructure and is not intended to be used directly from your code.

Sets a value indicating whether the page is processed synchronously or asynchronously.

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

protected bool AsyncMode { get; set; }
<asp:Page AsyncMode="True|False" />

Property Value

Type: System.Boolean
true if the page is processed asynchronously; otherwise, false.

The AsyncMode property is set by the Page parser when code for the page is generated. Use the Async attribute in @ Page directive to set this value.

Asynchronous pages do not work when the AspCompat attribute is set to true or the Transaction attribute is set to a value other than Disabled in the @ Page directive.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

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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