Updating file status in c#

[ATec Solution]

Windows.Storage.Pickers.FileSavePicker savePicker = new Windows.Storage.Pickers.FileSavePicker();
savePicker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.DocumentsLibrary;

// Dropdown of file types the user can save the file as
savePicker.FileTypeChoices.Add("Rich Text", new List<string>() { ".rtf" });

// Default file name if the user does not type one in or select a file to replace
savePicker.SuggestedFileName = "New Document";

Windows.Storage.StorageFile file = await savePicker.PickSaveFileAsync();
if (file != null)
{
// Prevent updates to the remote version of the file until we
// finish making changes and call CompleteUpdatesAsync.
Windows.Storage.CachedFileManager.DeferUpdates(file);
// write to file
Windows.Storage.Streams.IRandomAccessStream randAccStream =
await file.OpenAsync(Windows.Storage.FileAccessMode.ReadWrite);

Text1.Document.SaveToStream(Windows.UI.Text.TextGetOptions.FormatRtf, randAccStream);

// Let Windows know that we're finished changing the file so the
// other app can update the remote version of the file.
FileUpdateStatus status = await CachedFileManager.CompleteUpdatesAsync(file);
//Windows.Storage.Provider.FileUpdateStatus status = await Windows.Storage.CachedFileManager.CompleteUpdatesAsync(file);
if (status != Windows.Storage.Provider.FileUpdateStatus.Complete)
{
Windows.UI.Popups.MessageDialog errorBox =
new Windows.UI.Popups.MessageDialog("File " + file.Name + " couldn't be saved.");
await errorBox.ShowAsync();
}
}
Saving the file works fine but when I want to update it or replace it then it says it is open in another app and it wont let me replace it, what am I doing wrong?

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