DownloadStringCompletedEventHandler Delegate
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DownloadStringCompletedEventHandler Delegate


Represents the method that will handle the DownloadStringCompleted event of a WebClient.

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

public delegate void DownloadStringCompletedEventHandler(
	object sender,
	DownloadStringCompletedEventArgs e


Type: System.Object

The source of the event.

Type: System.Net.DownloadStringCompletedEventArgs

A DownloadStringCompletedEventArgs that contains event data.

When you create a DownloadStringCompletedEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event handler delegates, see NIB: Events and Delegates.

The following code example demonstrates downloading a string asynchronously.

// Sample call : DownloadStringInBackground2 ("");
public static void DownloadStringInBackground2 (string address)
    WebClient client = new WebClient ();
    Uri uri = new Uri(address);

    // Specify that the DownloadStringCallback2 method gets called
    // when the download completes.
    client.DownloadStringCompleted += new DownloadStringCompletedEventHandler (DownloadStringCallback2);
    client.DownloadStringAsync (uri);

The following method is called when the download completes.

private static void DownloadStringCallback2 (Object sender, DownloadStringCompletedEventArgs e)
    // If the request was not canceled and did not throw
    // an exception, display the resource.
    if (!e.Cancelled && e.Error == null)
        string textString = (string)e.Result;

        Console.WriteLine (textString);

.NET Framework
Available since 2.0
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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