Get a webpage - the async way , C#

Get a webpage - the async way

//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Net.Http;

using System.Threading.Tasks;
using System.Threading;
namespace Rextester
{
    public class Program
    {
        public static async void Main(string[] args)
        {
            ThreadPool.QueueUserWorkItem(f => RequestData("http://google.com"));
            Thread.Sleep(2000);
        }
        
        static async void RequestData(string uri)
        {
            using (var client = new HttpClient())
            {
                Console.WriteLine(System.Threading.Thread.CurrentThread.ManagedThreadId);
                Console.WriteLine(await client.GetStringAsync(uri)); //how's that differs from sync code? The thread is not being used while IO occurs.
                Console.WriteLine(System.Threading.Thread.CurrentThread.ManagedThreadId); //note - different thread, that was started only when IO finished.
            }
        }
        
    }
}


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