async await example

Test.cs

using System;
using System.Threading.Tasks;
public class HelloWorld
{
    public static async Task Main(string[] args)
    {
        Console.WriteLine ("Main Started.");
        var res = DoStuff();
        Console.WriteLine ("Mainda DoStuffdan qaytgan task olindi.");
        await res;
        Console.WriteLine("Main tugadi.");
    }
    public static async Task DoStuff()
    {
        Console.WriteLine("DoStuff boshlandi.");
        var res = await Task.Run(() => DoStuff2());
        Console.WriteLine($"Funksiya tugadi. Natija: {res}");
    }
    public static long DoStuff2()
    {
        long sum = 0;
        for (long i = 0; i < 100000000; i++)
        {
            if(i % 2 == 0)
                sum -= i;
            else
                sum += i;
        }
        return sum;
    }
}

NATIJA:
Main Started.
DoStuff boshlandi.
Mainda DoStuffdan qaytgan task olindi.
Funksiya tugadi. Natija: 50000000
Main tugadi.