c# - Difference between await Task and await Task.WhenAll

Question

What is the difference when using await on multiple await task vs waiting on all the tasks to finish. My under standing is the scenario 2 is better in terms of performance because both asyncTask1 and asyncTask2 are preformed in parallel.

scenario 1 :

async Task Task()
{
   await asyncTask1();
   await asyncTask2();
}

scenario 2 :

async Task Task()
{
    t1 = asyncTask1();
    t2 =  asyncTask2();
    await Task.WhenAll(createWorkflowtask, getTaskWorkflowTask);
}

Answer 1

In scenario 1, tasks are run sequentially (asyncTask1 must complete before asyncTask2 starts) while in scenario 2 the two tasks can run in parallel.