Not copying SQLite database in Windows 8.1 universal app

I am copying an existing database

However it appears that the table is being accessed before the database is copied (if I repeatedly reinstall the database copies). The following is in the MainPage.

Interestingly I can get a Windows Phone 8.1 variant to work, but not for Windows 8.1

private async Task CopyDatabase()
{ 

bool isDatabaseExisting = false;

        try
        {
            StorageFile storageFile = await ApplicationData.Current.LocalFolder.GetFileAsync("pmquestionsoct2014dt.sqlite");
            isDatabaseExisting = true;
            System.Diagnostics.Debug.WriteLine("DB exists");


        }
        catch
        {
            isDatabaseExisting = false;
            System.Diagnostics.Debug.WriteLine("DB doesn't exist");

        }

        if (!isDatabaseExisting)
        {
            var databaseFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Assets/pmquestionsoct2014dt.sqlite"));    


              await databaseFile.CopyAsync(ApplicationData.Current.LocalFolder, "pmquestionsoct2014dt.sqlite", NameCollisionOption.ReplaceExisting);

            System.Diagnostics.Debug.WriteLine("DB copied");

        }