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using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading;using System.Threading.Tasks;namespace ConsoleApp393{    class Program    {        static void Main(string[] args)        {            LoopCompletedDemo();            Console.ReadLine();        }        static void LoopCompletedDemo()        {            for(int i=0;i<10;i++)            {                Task task = Task.Run(() =>                {                    PrintTime(i);                });                task.Wait();                Console.WriteLine($"Loop {i} completed!\n\n");            }        }        private static void PrintTime(int i)        {            Console.WriteLine($"i is {i},Now is {DateTime.Now.ToString("yyyyMMddHHmmssffff")}");            Thread.Sleep(300);        }    }}