AnyPlace.MainPage.writeCompletedToIsolatedStorage C# (CSharp) Method

        private void writeCompletedToIsolatedStorage(string directory)
        {
            var settings1 = IsolatedStorageFile.GetUserStoreForApplication();
            if (settings1.FileExists(directory + "/Completed"))
            {
                settings1.DeleteFile(directory + "/Completed");
            }
            else
            {
                settings1.CreateDirectory(directory);
            }
            using (var fileStream = settings1.OpenFile(directory + "/Completed", FileMode.Create))
            {
                var serializer = new DataContractSerializer(typeof(String));
                serializer.WriteObject(fileStream, "done");
            }
        }