Доступ к классу в классе - C# (187497)

   public class Value
        {
            public int orderid { get; set; }
            public string ordernumber { get; set; }
            public string payid { get; set; }
            public double costall { get; set; }
            public string paydate { get; set; }
            public int paysystem { get; set; }
        }
        public class PayRequest
        {
            public string command { get; set; }
            public Value value { get; set; }
            public string check { get; set; }
        }

var obj = new PayRequest
            {
                command = "pay",
                value = new Value
                {
                    costall = 50.0,
                    orderid = 1730,
                    paydate = DateTime.Now.ToString(),
                    payid = "23211",
                    paysystem = 1,
                },
                check= ???