how to use for loop in Implicitly Typed Arrays using c#

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how to use for loop in Implicitly Typed Arrays using c#in below code.i need to loop through roomList in forloop in dynamic.already i created one list also


List:

   public class Inventory
    {
       
        public Inventory()
        {
            roomlist = new List<roomtariff>();
        }
        public List<roomtariff> roomlist { get; set; }

    }


public class RoomTariff
   {
       public string tarifSeq { get; set; }
       public string roomSeq { get; set; }
       public string tariffType { get; set; }
       public string roomType { get; set; }
       public string plan { get; set; }
    }

My code

for (int i = 0; i < child[0].roomlist.Count; i++)
            {
                var postdata = new
                {
                    fromDate = fromdate,
                    toDate = todate,
                    hotelRequest = new
                    {
                        roomList = new[]
                               {
                                           new { roomSeq = "54545", roomName = "A.c Room", tariffRequests = new[] { new { tarifSeq = "dfdf45b54", plan = "yu" } } },
                                           new { roomSeq = "5454", roomName = "Del Room", tariffRequests = new[] { new { tarifSeq = "gdgfdg;l;gfd",  plan = "Eu" } } },
                                           new { roomSeq = "5422", roomName = "Suite Room", tariffRequests = new[] { new { tarifSeq = "fdght411", plan = "Euuu" } } },
                                           new { roomSeq = "457", roomName = "Execu  Room", tariffRequests = new[] { new { tarifSeq = "gfgfgf",  plan = "tyt" } } },
                                           new { roomSeq = "222", roomName = "NonRoom", tariffRequests = new[] { new { tarifSeq = "gfgfg",  plan = "tyty" } } } }
                    },
                    datavisible = false
                };
 
string requestJson = Newtonsoft.Json.JsonConvert.SerializeObject(postdata);