using System;

 using System.Net;

 using System.Threading;

 using System.Threading.Tasks;

 namespace ConsoleApp1

 {

     class Program

     {

         static void Main(string[] args)

         {

             Console.WriteLine($"Main Start...{System.Threading.Thread.CurrentThread.GetHashCode()}");

             var rst = DisplayValueAsync();

             Console.WriteLine($"Main do some thing End...{System.Threading.Thread.CurrentThread.GetHashCode()}");

             Console.WriteLine($"Sub1  End...values is {rst.Result} {System.Threading.Thread.CurrentThread.GetHashCode()}");

             Console.Read();

         }

          public static async Task<int> DisplayValueAsync()

         {

             Console.WriteLine($"Sub call...{System.Threading.Thread.CurrentThread.GetHashCode()}");

            var rst= await Task<int>.Run(()=> {

                System.Threading.Thread.Sleep();

                Console.WriteLine($"Sub exec...{System.Threading.Thread.CurrentThread.GetHashCode()}");

                var random = new Random();

                return random.Next(,);

             });

             return rst;

         }

     }

 }