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BackgroundWorker.RunWorkerAsync Method (Object)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Starts running a background operation and includes a parameter for use by the background operation.

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


Public Sub RunWorkerAsync ( _
    argument As Object _
public void RunWorkerAsync(
    Object argument


  • argument
    Type: System.Object
    A parameter for use by the background operation in the DoWork event handler.


Exception Condition

IsBusy is true.


The RunWorkerAsync method submits a request to start the operation running asynchronously. When the request is processed, the DoWork event is raised, which in turn starts running your background operation.

If your background operation requires a parameter, you can provide it as the argument parameter to RunWorkerAsync.

If the background operation is already running, calling RunWorkerAsync again will raise an InvalidOperationException.

Version Information


Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0


For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.