public IsolatedStorageSettings()
{
IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication();
var stream = isf.OpenFile(_isfname, System.IO.FileMode.OpenOrCreate);
DataContractSerializer dcs = new DataContractSerializer(_dict.GetType());
_dict = dcs.ReadObject(stream) as Dictionary<string, string>;
stream.Close();
}