using System;

using System.Threading.Tasks;

using System.Threading;

public class Program

{

    public static void Main()

    {

        var task = Task.Run(() => {

                Thread.Sleep(4000); //4 seconds

                return "hello1";

            // if an exception in thrown from our async operation you need to capture that

            // exception will be swallowed if you dont have logic to capture it

        });

        // Console.WriteLine(task.Result); // not good - blocks the application until there is a result available

        task.ContinueWith((t) => {

            if(t.IsFaulted){

            //indicates that task have been completed with unhandled exception

                Console.WriteLine("unhandled exception");

            } 

            Console.WriteLine(t.Result); 

            // not good - running from the wrong thread - remember this is an async operation as well running on some other thread (not the main thread)

        });

    }

}