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WebClient.DownloadDataCompleted Event

Occurs when an asynchronous data download operation completes.

Namespace:  System.Net
Assembly:  System (in System.dll)
public event DownloadDataCompletedEventHandler DownloadDataCompleted

This event is raised each time an asynchronous data download operation completes. Asynchronous data downloads are started by calling the DownloadDataAsync methods.

The DownloadDataCompletedEventHandler is the delegate for this event. The DownloadDataCompletedEventArgs class provides the event handler with event data.

For more information about handling events, see Consuming Events.

The following code example demonstrates setting an event handler for this event.

    // Sample call : DownLoadDataInBackground ("http://www.contoso.com/GameScores.html");
    public static void DownloadDataInBackground (string address)
    {
        System.Threading.AutoResetEvent waiter = new System.Threading.AutoResetEvent (false);
        WebClient client = new WebClient ();
        Uri uri = new Uri(address);

        // Specify that the DownloadDataCallback method gets called 
        // when the download completes.
        client.DownloadDataCompleted += new DownloadDataCompletedEventHandler (DownloadDataCallback);
        client.DownloadDataAsync (uri, waiter);

        // Block the main application thread. Real applications 
        // can perform other tasks while waiting for the download to complete.
        waiter.WaitOne ();
    }

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows Phone 8.1, Windows Phone 8, 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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