using System.Diagnostics.CodeAnalysis;

using System.Linq;

using System.IO;

using System.Threading;

using System.Threading.Tasks;

using System;

​

public class Program

{

    public static async Task Main(string[] args)

    {

        Console.WriteLine(await TimeStepAsync(async() => await ContextSwitch(10)));

        Console.WriteLine(await TimeStepAsync(() => ContextSwitch(10)));

    }

    public static async Task<int> TimeStepAsync(Func<Task> func){

        var start = DateTimeOffset.Now;

        Console.WriteLine("starting method");

        await func();

        Console.WriteLine("done with method");

        var end = DateTimeOffset.Now;

        return (end-start).Milliseconds;

    }

    public static async Task ContextSwitch(int ct){

        for (int i=0;i<ct;i++){

            Console.WriteLine($"- iteration {i}");

            await Task.Delay(100);  

        }

    }

}