using System;

using System.Collections.Generic;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string json = @"

            {

              ""bankDetails"": [

                {

                  ""ABC Bank"": [

                    {

                      ""sNo"": 1,

                      ""acNo"": ""1235465"",

                      ""acBalance"": ""100.25""

                    },

                    {

                      ""sNo"": 2,

                      ""acNo"": ""1235467"",

                      ""acBalance"": ""50.25""

                    }

                  ],

                  ""bankName"": ""ABC Bank"",

                  ""totalAmount"": ""150.50""

                },

                {

                  ""XYZ Bank"": [

                    {

                      ""sNo"": 1,

                      ""acNo"": ""1248565"",

                      ""acBalance"": ""75.25""

                    }

                  ],

                  ""bankName"": ""XYZ Bank"",

                  ""totalAmount"": ""75.25""

                },

                {

                  ""BCD Bank"": [

                    {

                      ""sNo"": 1,

                      ""acNo"": ""145665"",

                      ""acBalance"": ""10.25""

                    },

                    {

                      ""sNo"": 2,

                      ""acNo"": ""195267"",

                      ""acBalance"": ""5.25""

                    }

                  ],

                  ""bankName"": ""BCD Bank"",

                  ""totalAmount"": ""15.50""

                }

              ]

            }";

​

        var root = JsonConvert.DeserializeObject<RootObject>(json);

        foreach (var bank in root.BankDetails)

        {

            Console.WriteLine(bank.BankName);

            foreach (var account in bank.Accounts)

            {

                Console.WriteLine("Account " + account.AccountNumber + ": " + account.Balance);

            }

            Console.WriteLine("Total: " + bank.TotalAmount);

            Console.WriteLine(new string('-', 25));

        }

    }

}

​

class RootObject

{

    public List<Bank> BankDetails { get; set; }

}

​

[JsonConverter(typeof(BankConverter))]

class Bank

{

    public string BankName { get; set; }

    public decimal TotalAmount { get; set; }

    public List<Account> Accounts { get; set; }

}

​

class Account

{

    [JsonProperty("sNo")]

    public int SequenceNumber { get; set; }

    [JsonProperty("acNo")]

    public string AccountNumber { get; set; }

    [JsonProperty("acBalance")]

    public decimal Balance { get; set; }

}

​

class BankConverter : JsonConverter

{

    public override bool CanConvert(Type objectType)

    {

        return objectType == typeof(Bank);

    }

​

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

    {

        JObject obj = JObject.Load(reader);

        Bank bank = new Bank();

        // populate bankName and totalAmount

        serializer.Populate(obj.CreateReader(), bank);

        // handle the dynamic key

        bank.Accounts = obj[bank.BankName].ToObject<List<Account>>(serializer);

        return bank;

    }

​

    public override bool CanWrite

    {

        get { return false; }

    }

​

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

    {

        throw new NotImplementedException();

    }

}

​