Windows apps
Collapse the table of content
Expand the table of content
Information
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.

WebClient.CancelAsync Method

Note: This method is new in the .NET Framework version 2.0.

Cancels a pending asynchronous operation.

Namespace: System.Net
Assembly: System (in system.dll)

public void CancelAsync ()
public void CancelAsync ()
public function CancelAsync ()

If an operation is pending, this method calls Abort on the underlying WebRequest.

When you call CancelAsync, your application still receives the completion event associated with the operation. For example, when you call CancelAsync to cancel a DownloadStringAsync operation, if you have specified an event handler for the DownloadStringCompleted event, your event handler receives notification that the operation has ended. To learn whether the operation completed successfully, check the Cancelled property on the base class of DownloadDataCompletedEventArgs in the event data object passed to the event handler.

If no asynchronous operation is in progress, this method does nothing.

Windows 98, Windows 2000 SP4, Windows Millennium Edition, 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.

.NET Framework

Supported in: 2.0

Community Additions

Show:
© 2017 Microsoft