如何停掉所有辅线程

 我在TIMER里面放了线程这样子循环，运行时候删除listView1.Items里的项时候会报错。怎么样才可以让其他线程不运行只运行主线程呢？
   private void timer1_Tick(object sender, EventArgs e)
        {            _n = 0;
          
            timer1.Enabled = false;
            
            Thread[] thrs = new Thread[listView1.Items.Count];
            
            for (int i = 0; i < listView1.Items.Count; i++)
            {                thrs[i] = new Thread(new ThreadStart(ThreadProc));
                Control.CheckForIllegalCrossThreadCalls = false;
                thrs[i].Start();                    
                
            }
            //thrs[i].Abort();
            Application.DoEvents();
            timer1.Enabled = true;
            
            
        }
         public void ThreadProc()
        {
            for (int i = 0; i < listView1.Items.Count; i++)
            {
                if (i == _n)
                {
                    string err = "";
                    string url = listView1.Items[i].SubItems["Url"].Text;
                    string page = fafa(url, out err);
                    gete(i, err, page, url);                    //break;
                    }
            }
            _n++;        }