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BackgroundWorker bgw = new BackgroundWorker();

        public MosaikPic(Bitmap Bitmap1)
        {
            //Konstruktor
            bgw.DoWork += new DoWorkEventHandler(bgw_DoWork);
            bgw.RunWorkerAsync();

        }

        private void bgw_DoWork(object sender, DoWorkEventArgs e)
        {
           //DoSmth.
         }