using System;

            using System.Threading.Tasks;   

public class Program

{

    public static async void Main()

    {

        var task = Test1Async();

        Console.WriteLine("Task started");

        Console.WriteLine("start await");

        await task;

        Console.WriteLine("Task complete");

    }

    private static async Task TestAsync()

    {

        await Test1Async();

    }

    private static async Task Test1Async()

    {

        int i = 0;

        while(true){

            Console.WriteLine(i);

            await Task.Delay(100);

            var d ="";  

            i++;

        }

    }

}