新手初学线程问题?

        private DateTime starttime = new DateTime();

        private void button5_Click(object sender, EventArgs e)

        {



            starttime=DateTime.Now;



            Thread thread = new Thread(new ThreadStart(Dosomething));



            thread.IsBackground = true;



            thread.Start();

        }



        private void Dosomething( )

        {

            

            while(true)

            {



                DateTime now = DateTime.Now;

                Thread.Sleep(100);



                if (now.Second > starttime.Second+10)

                {

                    //其它处理



                    break;

                }

            }

        }

问题1  break实行后这个线程是否还在运行?
问题2 Dosomething可不可以有参数?如Dosomething(int para)等等.
------解决方案--------------------
1、break跳出循环。如果事情干完了，就结束。
2、可以带参数。http://blog.csdn.net/wangzh300/article/details/6969354
------解决方案--------------------

  new Thread(new ThreadStart(() =>

        {

            Dosomething("aa");

        })).Start();



 private void Dosomething(string aa)

     &n