BackgroundWorker.ReportProgress Method (Int32, Object)
Raises the ProgressChanged event.
Assembly: System (in System.dll)
If you need the background operation to report on its progress, you can call the ReportProgress method to raise the ProgressChanged event. The WorkerReportsProgress property value must be true, or ReportProgress will throw an InvalidOperationException.
It is up to you to implement a meaningful way of measuring your background operation's progress as a percentage of the total task completed.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.