Show the difference between multiple await and Task.WhenAll

Program.cs

using System;
using System.CodeDom;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AsyncDiff
{

    public class SomeViewModel
    {
        public string Data { get; set; }
    }
    class Program
    {
        static void Main(string[] args)
        {
            var now = DateTime.Now;
            Test(MultipleAwait);
            Test(TaskWhenAll);
            Console.ReadLine();
        }

        private static void Test(Func<Task<SomeViewModel>> taskFunc)
        {
            var now = DateTime.Now;
            var x = taskFunc().Result;
            var endTime = DateTime.Now;
            Console.WriteLine($"{x.Data}: {(endTime - now)}");
        }

        public static async Task<SomeViewModel> MultipleAwait()
        {
            await SomeTask();
            await SomeTask();
            await SomeTask();
            return new SomeViewModel() { Data = "MultipleAwait" };
        }

        public static async Task<SomeViewModel> TaskWhenAll()
        {
            await Task.WhenAll(new[] {SomeTask(), SomeTask(), SomeTask()});
            return new SomeViewModel() { Data = "TaskWhenAll" };
        }

        public static async Task SomeTask()
        {
            await Task.Delay(2000);
//            return Task.FromResult<object>(null);
        }
    }
}