Threading and WPF (cont'd)

In the thread: http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/961c3a25-6c2b-4d61-af84-e97c7a784dd9

I asked about the threading in general and got a hint that nowadays I should use Async.

So I tried, but I seem to have understood something wrong.

I get:

Error 1 The 'await' operator can only be used within an async method. Consider marking this method with the 'async' modifier and changing its return type to 'Task'. C:\Users\xxx\Documents\Visual Studio 2012\Projects\my_project\NorthwindCaliburn\NorthwindCaliburn\ViewModels\EmpAddViewModel.cs 82 13 NorthwindCaliburn

In my "main class" constructor I call:

In that same class I have:

        async Task GetRegionsAsync()
        {
            using (var ctx = new NorthwindEntities())
            {
                foreach (Territory terr in ctx.Territories.Select(c => c))
                {
                    Territories.Add(terr.TerritoryID + " " + terr.TerritoryDescription + " " + terr.RegionID.ToString());
                    Console.WriteLine("Territory: " + terr.TerritoryID + " " + terr.TerritoryDescription + " " + terr.RegionID.ToString());
                }
            }
        }