Gets a value indicating whether the BackgroundWorker is running an asynchronous operation.
Assembly: System (in System.dll)
The following code example demonstrates how to use the property to wait for completion of a BackgroundWorker operation. This code example is part of a larger example described in How to: Download a File in the Background.
Private Sub downloadButton_Click( _ ByVal sender As Object, _ ByVal e As EventArgs) _ Handles downloadButton.Click ' Start the download operation in the background. Me.backgroundWorker1.RunWorkerAsync() ' Disable the button for the duration of the download. Me.downloadButton.Enabled = False ' Once you have started the background thread you ' can exit the handler and the application will ' wait until the RunWorkerCompleted event is raised. ' If you want to do something else in the main thread, ' such as update a progress bar, you can do so in a loop ' while checking IsBusy to see if the background task is ' still running. While Me.backgroundWorker1.IsBusy progressBar1.Increment(1) ' Keep UI messages moving, so the form remains ' responsive during the asynchronous operation. Application.DoEvents() End While End Sub
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.