Accessing UI Control from BackgroundWorker Thread

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You may not call Invoke on the list box, but on the form. For WinForms applications I use something like:

...
this.Invoke((MethodInvoker)delegate()
{
    // Do stuff on ANY control on the form.
});
...

Depending on the .NET version, you may have to declare a delegate for MethodInvoker yourself as

public delegate void MethodInvoker();

However, you might also consider using the ReportProgress feature of the Background Worker. The respective event handler should be called in the context of the form’s thread.

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