using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var exchangeRates = new[]

                    {

                        new {Currency = "USD", Rate = 1.2701},

                        new {Currency = "JPY", Rate = 138.97},

                        new {Currency = "BGN", Rate = 1.9558},

                        new {Currency = "CZK", Rate = 27.54},

                        new {Currency = "DKK", Rate = 7.4432},

                        new {Currency = "GBP", Rate = 0.7827},

                        new {Currency = "HUF", Rate = 312.18},

                        new {Currency = "LTL", Rate = 3.4528},

                        new {Currency = "PLN", Rate = 4.1827},

                        new {Currency = "RON", Rate = 4.4125},

                        new {Currency = "SEK", Rate = 9.2018},

                        new {Currency = "CHF", Rate = 1.2071},

                    };

​

        var batchNumber = 5;    // the batch size

        var batches = exchangeRates.Select((exchangeRate, index) =>

                                            new {ExchangeRate = exchangeRate, Index = index})

                                   .GroupBy(x => x.Index/batchNumber);

        int currentBatch = 1;

        foreach (var batch in batches)

        {

            Console.WriteLine("------------");

            Console.WriteLine("Batch no: {0}", currentBatch);

            Console.WriteLine("------------");

            int index = 1;

            foreach (var b in batch)

            {

                Console.WriteLine("{0} : {1} {2}", index, b.ExchangeRate.Currency, b.ExchangeRate.Rate);

                index++;

            }

            currentBatch++;

        }

    }

}