using System;
using System.Collections.Concurrent;

var response = Enumerable.Range(0, 1000);

var res = response.Chunk(100);


var ls = new List<Task>();
CancellationTokenSource factory = new();
ConcurrentBag<string> info = new ConcurrentBag<string>();
foreach (var element in res)
{

    var task = new Task(async () =>
    {
        await Task.Delay(1000000, factory.Token)
                        .ConfigureAwait(ConfigureAwaitOptions.SuppressThrowing);
        foreach (var item in element)
        {
            info.Add(item.ToString());

            Console.Write(item + "|");
        }
    }, TaskCreationOptions.LongRunning);
    ls.Add(task);
    task.Start();
}
await Task.Delay(3000);
factory.Cancel();
Task.WaitAll(ls.ToArray());
Console.WriteLine($"Counts Distinct Items:{info.Distinct().Count()} Count {info.Count}");
Console.ReadKey();