public ProgressWorker()
{
this._bgWorker.WorkerReportsProgress = true;
this._bgWorker.WorkerSupportsCancellation = true;
this._bgWorker.RunWorkerCompleted += _bgWorker_RunWorkerCompleted;
this._bgWorker.ProgressChanged += _bgWorker_ProgressChanged;
this._bgWorker.DoWork += _bgWorker_DoWork;
}