using System;

using System.Threading.Tasks;

using System.Threading;

public class Program

{

    // Что будет на экране

public static async Task<int> GetValue1()

{

    Console.WriteLine(Thread.CurrentThread.ManagedThreadId);

    return await Task.FromResult(100500);

}

​

public static async Task<int> GetValue2()

{

    Console.WriteLine(Thread.CurrentThread.ManagedThreadId);

    return 500100;

}

​

​

public static Task<int> GetValue3()

{

    Console.WriteLine(Thread.CurrentThread.ManagedThreadId);

    return Task.Run(() => 500100);

}

​

public static async Task Main(string[] args)

{

    Console.WriteLine(Thread.CurrentThread.ManagedThreadId); // 1

    var val1 = await GetValue1();

    Console.WriteLine(Thread.CurrentThread.ManagedThreadId);

    var val2 = await GetValue2();

    Console.WriteLine(Thread.CurrentThread.ManagedThreadId);

    var val3 = await GetValue3();

    Console.WriteLine(Thread.CurrentThread.ManagedThreadId);

}

}