Tasks in Serial and Parallel

output.txt

Converting serially took 3126 ms
Converting parallelly took 323 ms

TasksInParallel.linq

async void Main()
{
	var serialData = await ConvertSerially();
	var parallelData = await ConvertParallelly();
}

async Task<ICollection<string>> ConvertSerially()
{
	var convertedList = new List<string>();
	var stopwatch = Stopwatch.StartNew();
	
	foreach(var i in SeedData())
	{
		var value = await ConvertToStringExpensively(i);
		convertedList.Add(value);
	}
	
	stopwatch.Stop();
	Console.WriteLine("Converting serially took {0} ms", stopwatch.ElapsedMilliseconds);
	
	return convertedList;
}

async Task<ICollection<string>> ConvertParallelly()
{
	var stopwatch = Stopwatch.StartNew();

	var tasks = SeedData()
				.Select(async a => await ConvertToStringExpensively(a));
	var convertedList = await Task.WhenAll(tasks);
		
	stopwatch.Stop();
	Console.WriteLine("Converting parallelly took {0} ms", stopwatch.ElapsedMilliseconds);	
	
	return convertedList;
}

IEnumerable<int> SeedData()
{
	return Enumerable.Range(300, 10);
}

async Task<string> ConvertToStringExpensively(int input)
{
	await Task.Delay(input);
	return input.ToString();
}

// Define other methods and classes here