File Handling Windows Store Metro App C# XAML

Following code writes to file and reads from file in windows store app. This code can be a handler for a click event.

            StorageFolder localFolder = ApplicationData.Current.LocalFolder;
            StorageFile file = await localFolder.CreateFileAsync("t.txt", CreationCollisionOption.ReplaceExisting);
            await FileIO.WriteTextAsync(file, "Hello This is some text");
            StorageFile f = null;
            try
            {
                f = await localFolder.GetFileAsync("t.txt");

            }
            catch (Exception)
            {
                tbDummy.Text = "File DOes not exist";
            }
            if (f != null)
            {
                tbDummy.Text = await FileIO.ReadTextAsync(f);
            }