#if DEBUG                const string logfile = "demo.log";                try                {                    using (var sw = new System.IO.StreamWriter(System.IO.IsolatedStorage.IsolatedStorageFile.GetUserStoreForApplication().OpenFile(logfile, System.IO.FileMode.Append, System.IO.FileAccess.Write, System.IO.FileShare.Read)))                    {                        sw.WriteLine(string.Format("{0} [Demo] {1}", DateTime.Now, "a message"));                    }                }                catch (Exception ex) { Debug.WriteLine("Save {0} ERROR!! {1}", logfile, ex); }#endif