private void button1_Click(object sender, EventArgs e)
        {
            
            BackgroundWorker bw = new BackgroundWorker();
            bw.DoWork += new DoWorkEventHandler(bw_DoWork);
            bw.RunWorkerAsync();
        }

        void bw_DoWork(object sender, DoWorkEventArgs e)
        {
            //throw new NotImplementedException();
            
            SoundPlayer sp = new SoundPlayer(@"d:\1.wav");
            sp.Play();
        }