sealed class  MyClass : IDisposable
        {
            public MyClass Subscribe(Action<object, EventArgs> action)
            {
                if (action == null) throw new ArgumentException("dfs");
                //.....
                return this;
            }

            private int _value;
            public int SetValue
            {
                set
                {
                    if(_value==value) throw new ArgumentException("dfs");
                    _value = value;
                }
            }
            public void Dispose()
            {
                Console.Write("pq17");
            }
        }

        static void Main(string[] args)
        {
            try
            {
                using (var s = new MyClass{SetValue = 0})
                {

                }
                using (var s = new MyClass().Subscribe(null))
                {

                }
            }
            catch {}
            Console.Read();
        }