WPF Binding not working unless used with async code - wpf

Question

I have a Label with the Content property bound to a string on a ViewModel (Prism/MVVM). When I run this method, assigning "pending" to that string, the value changes, but the view never updates. It does update on the second assignment ("success") though.
I fiddled around trying to force an update with RaisePropertyChanged with no success then tried running parts of the code async. That worked!?! - but I have no clue why. Any Idieas on this problem? Any remedy without the async workaround?
XAML:
<Label
Content="{Binding DbaseCreateSuccess, UpdateSourceTrigger=PropertyChanged}">
</Label>
Method sync:
private void DbaseCreate()
{
DbaseCreateSuccess = "pending";
string[] files = Directory.GetFiles("Scripts", "*.*", SearchOption.AllDirectories);
String databaseName = "testbase";
String databaseScript = "testbase.sql";
int fileCount = 0;
foreach (String file in files)
{
if (file.Contains(databaseScript))
{
DataService.Runscript(file);
}
}
foreach (String file in files)
{
FileInfo info = new FileInfo(file);
Trace.WriteLine("FileExtension: " + info.Extension);
if (info.Extension == ".sql" && !file.Contains(databaseScript))
{
++fileCount;
DataService.Runscript(file, databaseName);
}
}
if (DataService.GetTableNames(databaseName).Count == fileCount)
{
DbaseCreateSuccess = "success";
}
Method async:
private async void DbaseCreate()
{
DbaseCreateSuccess = "pending";
string[] files = Directory.GetFiles("Scripts", "*.*", SearchOption.AllDirectories);
String databaseName = "testbase";
String databaseScript = "testbase.sql";
int fileCount = 0;
await Task.Factory.StartNew(() =>
{
foreach (String file in files)
{
if (file.Contains(databaseScript))
{
DataService.Runscript(file);
}
}
foreach (String file in files)
{
FileInfo info = new FileInfo(file);
Trace.WriteLine("FileExtension: " + info.Extension);
if (info.Extension == ".sql" && !file.Contains(databaseScript))
{
++fileCount;
DataService.Runscript(file, databaseName);
}
}
});
if (DataService.GetTableNames(databaseName).Count == fileCount)
{
DbaseCreateSuccess = "success";
}
}
ViewModel:
public class DatabaseAdminViewModel : BindableBase
{
private readonly IUnityContainer _container;
private readonly IRegionManager _regionManager;
private String _DbaseCreateSuccess;
public String DbaseCreateSuccess { get { return _DbaseCreateSuccess; } set { SetProperty(ref _DbaseCreateSuccess, value, "DbaseCreateSuccess"); } }
public DelegateCommand DbaseCreateCommand { get; set; }
public DatabaseAdminViewModel(IUnityContainer container, IRegionManager regionManager)
{
_regionManager = regionManager;
_container = container;
DbaseCreateSuccess = "idle";
DbaseCreateCommand = new DelegateCommand(DbaseCreate);
}
private async void DbaseCreate()
{
DbaseCreateSuccess = "pending";
string[] files = Directory.GetFiles("Scripts", "*.*", SearchOption.AllDirectories);
String databaseName = "testbase";
String databaseScript = "testbase.sql";
int fileCount = 0;
await Task.Factory.StartNew(() =>
{
foreach (String file in files)
{
if (file.Contains(databaseScript))
{
DataService.Runscript(file);
}
}
foreach (String file in files)
{
FileInfo info = new FileInfo(file);
Trace.WriteLine("FileExtension: " + info.Extension);
if (info.Extension == ".sql" && !file.Contains(databaseScript))
{
++fileCount;
DataService.Runscript(file, databaseName);
}
}
});
if (DataService.GetTableNames(databaseName).Count == fileCount)
{
DbaseCreateSuccess = "success";
}
}
}