using System;

using System.Linq;

using System.Threading;

using System.Threading.Tasks;

​

namespace Example

{

    public class Program

    {

        static void Log(string message)

        {

            Console.WriteLine

                (

                    "{0:yyyy-MM-dd HH:mm:ss.fff} [{1:X4}] {2}", 

                    DateTime.Now, 

                    Thread.CurrentThread.ManagedThreadId, 

                    message

                );

        }

        static async Task Execute(params Func<Task>[] actions)

        {

            var tasks = actions.Select( action => action() );

            await Task.WhenAll(tasks);

        }

        public static async Task MainAsync()

        {

            await Execute

            (

                async () => 

                {

                    await Task.Delay(3000);

                    Log("Function 1 done");

                }

                ,

                async () =>

                {

                    await Task.Delay(3000);

                    Log("Function 2 done");

                }

            );

        }

        public static void Main()

        {

            Log("Run started.");

            MainAsync().GetAwaiter().GetResult();

            Log("Run complete.");

        }

    }

}