Implementation example of a Task with C# 5+

AsyncProcessTest.cs

using System;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    public class AsyncProcessTest
    {
        // This function is going to start an expensive process.
        // Thanks to async/await the main Thread will not be blocked!
        public async void Initialize()
        {
            Console.WriteLine("Starting The Expensive Process...");
            var number = await CalculateThingsAsync();
            Console.WriteLine($"The result is {number}");
        }

        // The Task will returns an integer when it's done.
        public async Task<int> CalculateThingsAsync()
        {
            var task = Task.Run(() => DoExpensiveProcess());
            return await task;
        }

        // The expensive process.
        private int DoExpensiveProcess()
        {
            var counter = 0;

            for (var i = 0; i < int.MaxValue; i++)
                counter++;

            return counter;
        }
    }

    class Program
    {
        // Entry Point.
        static void Main(string[] args)
        {
            // Start the example.
            var p = new AsyncProcessTest();
            p.Initialize();
            Console.ReadKey();
        }
    }
}