using System;

using System.Threading;

using System.Threading.Tasks;

​

public class Program

{

    public static void Main(string[] args)

    {

        CallerWithAsyn();

        Console.WriteLine("Called CallerWithAsync");

        Console.ReadLine();

    }

    private async static void CallerWithAsyn()

    {

        string result = await GreetingAsync("Stephanie");

        Console.WriteLine(result); 

    }

    private static string Greeting(string name)

    {

        Thread.Sleep(3000);

        return string.Format("Hello, {0}", name);

    }

    private static Task<string> GreetingAsync(string name)

    {

        return Task.Run<string>(() => Greeting(name));

    }

}