Write JSON object to Windows Phone Isolated Storage

Write JSON object to Windows Phone Isolated Storage

I'm trying to save a JSON object that is returned from Azure Mobile
Services to the Windows Phone isolated storage. I've started with the code
below, but I'm not entirely sure how to actually write the file to
Isolated Storage or what format to save it in (XML, TXT, etc.).
string offlineData = Path.Combine("WPTracker", "Offline");
string offlineDataFile = Path.Combine(offlineData, "phones.xml");
var store = IsolatedStorageFile.GetUserStoreForApplication();
//Query
try
{
phoneList = await phoneTable
.Where(PhoneItem => PhoneItem.Publish == true)
.OrderBy(PhoneItem => PhoneItem.FullName)
.ToListAsync();
}
catch (MobileServiceInvalidOperationException f)
{
MessageBox.Show(f.Response.Content.ToString(),
string.Format("{0} (HTTP {1})",
f.Response.Content,
f.Response.StatusCode), MessageBoxButton.OK);
}
//Write
IsolatedStorageFileStream dataFile = null;
dataFile = store.OpenFile(offlineDataFile, FileMode.Create);
DataContractSerializer ser = new
DataContractSerializer(typeof(IEnumerable<Phones>));
StringBuilder sb = new StringBuilder();
StringWriter sw = new StringWriter(sb);
JsonWriter jWriter = new JsonTextWriter(sw);
ser.WriteObject(dataFile, phoneList);
dataFile.Close();
Any suggestions? :)