C#入门：为什么我写了以下的C#代码，好像线程根本就没有执行啊？求高手指点

        public Form1()
        {
            InitializeComponent();
            thread1 = new Thread(new ThreadStart(Fun1));
            thread2 = new Thread(new ThreadStart(Fun2));
            //加上
            thread1.Start();
            thread2.Start();
        }

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