C#界面卡死有关问题

C#界面卡死问题
各位高手
  我在界面1和界面2转换时总出现当按下切换按钮后界面卡死在当前界面，像死机一样，不知该怎么解决，希望各位高手能帮忙解决，谢谢了，以下是我的转换程序，希望各位帮忙修改。
 private void Switch_Click(object sender, EventArgs e)
  {
  try
  {
  comm.DataReceived -= comm_DataReceived;//取消注册串口接收事件
  comm.Close();//关闭串口
  }  
  finally
  {
   
  Canshu_Class.flag = true;

  this.Close();//关闭当前界面
  DanMian d1 = new DanMian();
  d1.ShowDialog();//打开新界面
   
  }
  }

[解决办法]
试试BackgroundWorker

C# code

private void Switch_Click(object sender, EventArgs e){    BackgroundWorker bgWorker = new BackgroundWorker();    bgWorker.DoWork += new DoWorkEventHandler((sender1, e1) =>    {        try        {            comm.DataReceived -= comm_DataReceived;//取消注册串口接收事件            comm.Close();//关闭串口        }        finally {  }    });    bgWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler((sender2, e2) =>    {        Canshu_Class.flag = true;        this.Close();//关闭当前界面        DanMian d1 = new DanMian();        d1.ShowDialog();//打开新界面    });    bgWorker.RunWorkerAsync();}