Processing large number of items in parallel

Parallel.cs

//Task Parallel library dataflow can be obtained by nuget: https://www.nuget.org/packages/System.Threading.Tasks.Dataflow/
var watch = new System.Diagnostics.Stopwatch();
watch.Start();

Action<int> an = n => {
    //add your processing logic here
    Console.WriteLine(n);
};

var options = new ExecutionDataflowBlockOptions
{
    MaxDegreeOfParallelism = DataflowBlockOptions.Unbounded
};

var actionBlock = new ActionBlock<int>(an, options);
Parallel.ForEach(Enumerable.Range(1, 100), (x) => {
    actionBlock.Post(x);
});

actionBlock.Complete();
actionBlock.Completion.Wait();

watch.Stop();
Console.WriteLine($"Time take to execute: {watch.ElapsedMilliseconds} ms");

Console.ReadLine();