using System;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

    var batchsize=10;

    var batchrecords=500;

    var totalrecords=1000;

​

            var options = new ParallelOptions()

            {

                MaxDegreeOfParallelism = 2

            };

            int smsCount = int.MaxValue;

            var batchSize = (int)Math.Ceiling((double)totalrecords / 2);

​

            Parallel.For(1, 3, options, async i =>

            {

            Console.WriteLine("Start");

               Console.WriteLine(((i) * batchSize));

               Console.WriteLine(i);

                 Parallel.For(1, 3, options, async j =>

{

     Console.WriteLine("Inner");

    Console.WriteLine(((j) * batchSize));

               Console.WriteLine(j);

});

            });

    }

}