using System;

using Newtonsoft.Json.Linq;

​

public class Program

{

    public static void Main()

    {

        var responseString =  "{\"GetAlertingTransactionsResult\":\"{\\\"Success\\\":true,\\\"Data\\\":[{\\\"RowNum\\\":\\\"1\\\",\\\"TransactionID\\\":\\\"611\\\",\\\"TransactionType\\\":\\\"Authorization\\\",\\\"Channel\\\":\\\"POS\\\",\\\"TxnStatusDescription\\\":\\\"Processed\\\",\\\"ErrorCode\\\":\\\"0000\\\",\\\"MID\\\":\\\"999222222222222\\\",\\\"TID\\\":\\\"99922236\\\",\\\"MerchantName\\\":\\\"NEW POS TEST MERCHANT\\\",\\\"MerchantAddress\\\":\\\"TEST ADDRESS LINE1 TEST ADDRESS LINE2\\\",\\\"TransactionAmount\\\":\\\"999.9900\\\",\\\"TipAmount\\\":\\\"0.0000\\\",\\\"DiscountAmount\\\":\\\"0.0000\\\",\\\"TotalAmount\\\":\\\"999.9900\\\",\\\"ApplicationVersion\\\":\\\"V6.0.0\\\",\\\"ApplicationID\\\":\\\"A0000007362010\\\",\\\"TxnDateTime\\\":\\\"7\\/9\\/2020 2:36:07 PM\\\",\\\"RequestDateTime\\\":\\\"7\\/9\\/2020 2:36:59 PM\\\",\\\"ResponseDateTime\\\":\\\"7\\/9\\/2020 2:36:59 PM\\\",\\\"InvoiceNumber\\\":\\\"4\\\",\\\"OldInvoiceNumber\\\":\\\"0\\\",\\\"BatchNumber\\\":\\\"15\\\",\\\"AuthNumber\\\":\\\"123\\\",\\\"AssociationName\\\":\\\"PayPakCard\\\",\\\"TC\\\":\\\"123\\\",\\\"ExpiryDate\\\":\\\"123\\\",\\\"ARQC\\\":\\\"2C254884E80D7FD2\\\",\\\"CardHolderName\\\":\\\"DEBIT\\/PAYPAK              \\\",\\\"MaskedCardNumber\\\":\\\"2205 60** **** 0476\\\",\\\"Cardtype\\\":\\\"CHIP\\\",\\\"TSI\\\":\\\"6800\\\",\\\"TVR\\\":\\\"123\\\",\\\"AppLabel\\\":\\\"PayPak Debit\\\",\\\"TotalTxnCount\\\":\\\"0\\\",\\\"TerminalSerialNumber\\\":\\\"82683858\\\",\\\"CompositeKey\\\":\\\"123\\\",\\\"PINCaptureCode\\\":\\\"1\\\",\\\"IsReprint\\\":\\\"0\\\",\\\"CustomerMobileNo\\\":null,\\\"IPAddress\\\":\\\"43.245.8.61\\\",\\\"RRN\\\":\\\"123\\\"}],\\\"TotalNumberOfRecords\\\":1}\"}";

        var jObject = JObject.Parse(responseString)["GetAlertingTransactionsResult"];

        var jDataObject = JObject.Parse(jObject.ToString());

        var objectArray = JArray.Parse(jDataObject["Data"].ToString());

        Console.WriteLine(objectArray[0]["TransactionID"].ToString());

    }

}