using System;

using System.Collections.Generic;

using System.Threading.Tasks;

​

public class Program

{

    public async static Task Main()

    {

        var asyncEnumerable = GetAsyncEnumerable();

        await foreach (var item in asyncEnumerable)

        {

            Console.WriteLine(item);

        }

        Console.WriteLine("Finished");

    }

    public static async IAsyncEnumerable<string> GetAsyncEnumerable()

    {

        yield return await Task.FromResult("a");

        yield return await Task.FromResult("b");

    }

}