static void Main(string[] args)
{
AsyncTask _asyncTask = new AsyncTask();
var start = DateTime.Now;
var c1 = _asyncTask.ReadFileSync1();
var c2 = _asyncTask.ReadFileSync2();
var c3 = _asyncTask.ReadFileSync3();
var end = DateTime.Now;
Console.WriteLine("Time taken {0}", end - start);
start = DateTime.Now;
var taskSum = _asyncTask.Sum(2, 2);
var taskDelay = _asyncTask.DoSomething();
Task.WaitAll(taskSum, taskDelay);
end = DateTime.Now;
Console.WriteLine("{0}", taskSum.Result);
Console.WriteLine("Time taken! {0}", end - start);
var task1 = _asyncTask.ReadFile1();
var task2 = _asyncTask.ReadFile2();
var task3 = _asyncTask.ReadFile3();
start = DateTime.Now;
Task.WaitAny(task1, task2, task3);
Console.WriteLine("Task1, completed: {0}", task1.IsCompleted);
// this forces everyone to wait for this Task1
// Console.WriteLine("Task1, completed: {0}", task1.Result);
Console.WriteLine("Task2, completed: {0}", task2.IsCompleted);
Console.WriteLine("Task3, completed: {0}", task3.IsCompleted);
Console.WriteLine("Task3, completed: {0}", task3.Result);
end = DateTime.Now;
Console.WriteLine("Time taken! {0}", end - start);
}