c# - Async - Which of these is correct -

from below 2 scenario(s), 1 of them correct way of doing asynchronous programming in c#?

scenario-1

public async task<t1> addsomethingasync(param) {     return await someotherfunctionfromthirdpartylibraryforioasync(param); } 

then

list<task> tasks=new list<task>(); foreach(var task in fromalltasks()) {     tasks.add(addsomethingasync(task)); } await task.whenall(tasks.asparallel()); 

scenario-2

public async task<t1> addsomethingasync(param) {     return someotherfunctionfromthirdpartylibraryforioasync(param); } 

then

list<task> tasks=new list<task>(); foreach(var task in fromalltasks()) {     tasks.add(someotherfunctionfromthirdpartylibraryforioasync(task)); } await task.whenall(tasks.asparallel()); 

the difference between 2 is, later not having await keyword inside addsomethingasync function.

so here update - want know achieve is, tasks should executed in parallel , asynchronously. (my thinking in scenario-1, call awaited inside addsomethingasync , hurt @ upper layer blocking next loop execute. confirm

scenario 3

public task<t1> addsomethingasync(param) {     return someotherfunctionfromthirdpartylibraryforioasync(param); } 

then

list<task> tasks=new list<task>(); foreach(var task in fromalltasks()) {     tasks.add(someotherfunctionfromthirdpartylibraryforioasync(task)); } await task.whenall(tasks); 

if not awaiting - don't need async keyword. doing asparallel nothing in case too.