using System;

using System.Diagnostics;

​

class AsyncAwaitTest

{

    static async Task Main(string[] args)

    {

        Stopwatch stopWatch = new Stopwatch();

​

        stopWatch.Start();

        Console.WriteLine(await Process());

        Console.WriteLine();

        Console.WriteLine(await Process1());

        stopWatch.Stop();

​

        Console.WriteLine($"Elapsedseconds - {stopWatch.Elapsed.TotalSeconds}");

        Console.ReadLine();

    }

​

    private static async Task<int> Process()

    {

        int a = await Task1();

        int b = await Task2();

        int c = await Task3();

​

        return a+b+c;

    }

​

    private static async Task<int> Process1()

    {

        var a = Task1();

        var b = Task2();

        var c = Task3();

​

        return await a+ await b+ await c;

    }

​

​

    private static async Task<int> Task1()

    {

        await Task.Delay(1000);

        return 10;

    }

​

    private static async Task<int> Task2()

    {

        await Task.Delay(2000);

        return 10;

    }

​

    private static async Task<int> Task3()

    {

        await Task.Delay(3000);

        return 10;

    }

}

​