using System;

using System.Linq;

using System.Threading.Tasks;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

    public async Task Foo()

    {

        dynamic[] ds = new dynamic[] {new object(), new object() };

        var tasks = ds.Select(d => Foo2(d));

        await Task.WhenAll(tasks);

    }

​

    public async Task Foo3(dynamic d)

    {

        var task = Foo2(d);

        await task;

    }

    public async Task Foo2(dynamic param)

    {

        await Task.Run(() => {});

    }

    public async Task Moo()

    {

        object[] ds = new object[] {new object(), new object() };

        var tasks = ds.Select(d => Moo2(d));

        await Task.WhenAll(tasks);

    }

    public async Task Moo2(object param)

    {

        await Task.Run(() => {});

    }

}