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简单写一下

    protected void Page_Load(object sender, EventArgs e)
    {
        Run();
    }

    static void Run()
    {
        Task<string> task1 = new Task<string>(() =>
        {
            return Run1("1");
        });
        task1.Start();
        Task<string> task2 = new Task<string>(() =>
        {
            return Run1("2");
        });
        task2.Start();


        Task.WaitAll(task1, task2);

        string s1 = task1.Result;
        string s2 = task2.Result;

    }

    static string Run1(string s)
    {
        Thread.Sleep(20000);
        return s;
    }