public async void GetSomethingAsync()
{
    //do worked, and caller will be block.
    var result = await DoWorkAsync(); 
    // DoWorkAsync() funciton return a Task<value> or other thing that async funciton is allowed
    // except void
    // and the control will return to the caller of GetSomethingAsync()
        
    ResultHandler(result.value);
    // when DoWorkAsync() finish the work, the control will come back to the point that await is used
    // and then the other work that need the real result of DoWorkAsync() can go on

    return;
}