static void Main(string[] args)
    {
        ActionTest target   = new ActionTest();
        MethodTest instance = new MethodTest();

        target.DoExpressionAction(() => instance.Method1().Method2());
        Console.ReadLine();
    }
    static void Main(string[] args)
    {
        ActionTest target = new ActionTest();

        target.DoAction(() => Console.WriteLine("Action"));

        target.DoExpressionAction(() => Console.WriteLine("ExpressionAction"));

        Console.ReadLine();
    }