Access is denied. When i try CRUD XML files using XAML for windows 8

Question

It doesn't throw this error everytime, thats what makes it strange. I got 50% chance that it works.

This is how I call the save method

private async void btnSave_Click(object sender, RoutedEventArgs e)
{
    await settings.WriteSettings(settings);
}

And this is the method itself

public async Task WriteSettings(Settings settings)
{
    var ser = new System.Xml.Serialization.XmlSerializer(typeof(Settings));
    var writer = new StringWriter();
    ser.Serialize(writer, settings);
    dom.LoadXml(writer.ToString());
    StorageFolder sf = ApplicationData.Current.LocalFolder;
    StorageFile st;
    st = await sf.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting); // here i get the error
    await dom.SaveToFileAsync(st);
}

I hope you guys understand the problem and you can help me getting a solution

Answer 1

I got the reason why i get Acces denied when i try to Acces a file more than once. It's because i didn't close the file after using it.

This is how i acces files now:

public static async Task WriteSettings(Settings settings)
    {
        StorageFile file = await ApplicationData.Current.RoamingFolder.CreateFileAsync(filename, CreationCollisionOption.ReplaceExisting);
        var stream = await file.OpenStreamForWriteAsync();

        var ser = new XmlSerializer(typeof(Settings));
        ser.Serialize(stream, settings);

        await stream.FlushAsync(); // This
        stream.Dispose(); // And this helped me solve my problem
    }