/*BackgroundWorker*/
1：         using (var appinstruction = new BackgroundWorker())
            {
                appinstruction.DoWork += appinstruction_DoWork;
                appinstruction.RunWorkerCompleted += appinstruction_RunWorkerCompleted;
                appinstruction.RunWorkerAsync();
            }
       
2：//執行
          void appinstruction_DoWork(object sender, DoWorkEventArgs e)
            {
          //程式碼
          }
        
        //完成
        void appinstruction_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
          //程式碼
        }




/*IAsyncResult*/


     IAsyncResult result = this.BeginInvoke(new MethodInvoker(() =>
    {  
 
        //程式碼
     }));
     result.AsyncWaitHandle.WaitOne(-1, false);






3/*BeginInvoke*/


      this.BeginInvoke((MethodInvoker)delegate
         {
          //程式碼
         });