Cross-thread operation not valid: Control accessed from a thread other than the thread it was created on.

http://stackoverflow.com/questions/142003/cross-thread-operation-not-valid-control-accessed-from-a-thread-other-than-the

Multithreading in .NET With the BackgroundWorker

http://amgadhs.com/index.php/2008/11/multithreading-in-net-with-the-backgroundworker/