using System;

​

// Allows the "Task" return type

using System.Threading.Tasks;

public class Program

{

    // Declare an async function with "async"

    private static async Task<string> ReturnHello()

    {

        return "hello world";

    }

    // Main can be async -- no problem

    public static async Task Main()

    {

        // await an async string

        string result = await ReturnHello();

        // Print the string we got asynchronously

        Console.WriteLine(result);

    }

}