Notes

using System.Diagnostics;

class Program
{
private static object lockObject = new object();
private static int counter = 0;
static async Task Main()
{
//Thread t1 = new Thread(Loop1);
//Thread t2 = new Thread(Loop2);
//t1.Start();
//t1.Join();
//t2.Start();
//t2.Join();

//IncreaseCounter();
//DecraseCounter();

//new Thread(IncreaseCounter).Start();
//new Thread(DecraseCounter).Start();

//Console.WriteLine(counter);


string[] uris = new string[] { "http://www.google.com", "http://www.microsoft.com", "http://www.apple.com" };
using HttpClient client = new HttpClient();


//async
Stopwatch stopwatch = new Stopwatch();
List<Task<string>> tasks = new List<Task<string>>();
stopwatch.Start();
foreach (var uri in uris)
{
tasks.Add(client.GetStringAsync(uri));
}

Task.WhenAll(tasks);
stopwatch.Stop();
foreach (var item in tasks)
{
Console.WriteLine(item.Result.Length + $"- {stopwatch.ElapsedMilliseconds}");
}

stopwatch.Reset();


///sync
stopwatch.Start();
foreach (var item in uris)
{
var result = client.GetStringAsync(item).Result;
Console.WriteLine(result.Length + $"- {stopwatch.ElapsedMilliseconds}");
}

}


























static void IncreaseCounter()
{
for (int i = 0; i < 5000000; i++)
{
lock (lockObject)
{
counter++;
}
}
}

static void DecraseCounter()
{
for (int i = 0; i < 5000000; i++)
{
lock (lockObject)
{
counter--;
}
}
}


static void Loop1()
{
for (int i = 0; i < 500; i++)
{
Console.WriteLine(i);
}
}

static void Loop2()
{
for (int i = 500; i < 1000; i++)
{
Console.WriteLine(i);
}
}
}