struct MyStruct {
        public int Value { get; set; }

        public void SetValue(int newValue) {
            Value = newValue;
        }

        public MyStruct(int value) {
            Value = value;
        }
    }

    class Program {

        static MyStruct MyStruct { get; set; }

        static void Main(string[] args) {
            MyStruct = new MyStruct(100);
            Console.WriteLine(MyStruct.Value);
            MyStruct.SetValue(777);
            Console.WriteLine(MyStruct.Value);
        }
    }