Access file in windows store using c# to write?

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C#

In my project. I created a file in folder "Data/history.txt". I can access history.txt to read somethings from it, by using code:
StorageFile file = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Data/history.txt"));
StreamReader reader = new StreamReader(await file.OpenStreamForReadAsync());
while (!reader.EndOfStream)
{
string s = reader.ReadLine();
}

but I can't write any thing to this file, by using code:
StorageFile file = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Data/history.txt"));
await Windows.Storage.FileIO.AppendTextAsync(file, text + '\n');

After build, I received an info about access file:
Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))
If you are attempting to access a file or registry key, make sure it is not read-only.
Make sure you have sufficient privileges to access this resource...

Can anyone help me, plz??
Thanks for your time!!