Program.cs

using System;
using System.Linq;
using System.Collections.Generic;
using System.Collections;
using System.Threading;
using System.Threading.Tasks;

class Program
{
    static void Main(string[] args)
    {
        var task1 = DoSomeWork("chunk 1");
        var task2 = DoSomeWork("chunk 2");
        var task3 = DoSomeWork("chunk 3");

        Task.WaitAll(task1, task2, task3);
    }

    static async Task DoSomeWork(string chunkName)
    {
        using (new SomeDisposable(chunkName))
        {
            Console.WriteLine("Starting to do work");
            await Task.Delay(5000);
            Console.WriteLine("Finishing work");
        }
    }
}

public class SomeDisposable : IDisposable
{
    private string m_chunkName;
    public SomeDisposable(string chunkName)
    {
        m_chunkName = chunkName;
        Console.WriteLine("Created disposable for chunk {0}!", m_chunkName);
    }

    void IDisposable.Dispose()
    {
        Console.WriteLine("Disposed disposable for chunk {0}!", m_chunkName);
    }
}