c# return task list
private async Task<List<Item>> GetListAsync(){
//Create a list object and assign it to a new task
//which returns your list object
List<Item> list = await Task.Run(() => manager.GetList());
return list;
//Or you may just need to await something and just return a list
await SomeMethod();
List<Item> list1 = new List<Item>();
return list;
}