using System;

using System.Collections.Generic;

using System.Linq;

using System.IO;

using System.Drawing;

using System.Drawing.Imaging;

using System.Threading.Tasks;

public class Program

{

    private static Dictionary<string, bool> _directAnswers;

    public static void Main()

    {           

        var task = MeasureLatency(() => TestTask(2));

        task.Wait();        

        Console.WriteLine("Task result: " + task.Result);           

    }   

    private static async Task<T> MeasureLatency<T>(Func<Task<T>> task) {

        Console.WriteLine("Start measuring: " + DateTime.Now);      

        try 

        {           

            return await task();

        }

        finally 

        {

            Console.WriteLine("Finish measuring: " + DateTime.Now);     

        }

    }

    private static async Task<int> TestTask(int data)

    {

        await Task.Delay(1500);

        return data * data;

    }

}   

​