using System;

using System.Threading;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        Task<Double>[] taskArray = {

            Task<Double>.Run(() => DoComputation(1)),

            Task<Double>.Run(() => DoComputation(100)),

            Task<Double>.Run(() => DoComputation(1000)),

        };

        for(int i = 0; i < taskArray.Length; i++)

        {

            Console.WriteLine("{0:N2}", taskArray[i].Result);

        }

    }

    private static Double DoComputation(Double start)

    {

        Double sum = 0;

        for (var value = start; value <= start + 10; value += .1)

            sum += value;

​

        return sum;

    }

}