Windows Phone多线程测试代码最后显示的出来的结果有时是0

        // Constructor
        public MainPage()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            Thread th1 = new Thread(new ThreadStart(GetNum));
            Thread th2 = new Thread(new ThreadStart(GetNum));

            th1.Start();
            th2.Start();

            textBlock1.Text = num.ToString();
        }

        private void GetNum()
        {
            lock{

                   for (int i = 0; i < 50; i++)
                   {
                     num++;
                    }                }         }    }

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