public AccountDatabaseCacheDependency(string key,AccountDatabaseCacheDependencyState state, int pollTime)
     : base(key, pollTime)
 {
     _state = state;
     //Polling = pollTime;
 }
        /// <summary>
        /// Starts the store auto saving.
        /// </summary>
        public static void StartStoreAutoSaving()
        {
            // save store to disk every hour.
            TimeSpan dueTime = new TimeSpan(0,0,0,60,0);

            if ( System.Web.HttpContext.Current == null )
            {
                autoSavingTimer = new Timer(new TimerCallback(SaveAccountDatabase), null, dueTime, dueTime);
            }
            else
            {
                // Timer timer = new Timer(new TimerCallback(SaveAccountDatabase), null, dueTime, dueTime);
                // System.Web.HttpRuntime.Cache.Insert("SalsTimer", timer);

                AccountDatabaseCacheDependencyState state = new AccountDatabaseCacheDependencyState();
                state.CurrentAccountCount =  AccountManager.AccountDatabase.Accounts.Length;
                state.AccountDatabasePath = System.Web.HttpContext.Current.Server.MapPath("users/AccountDatabase.xml");
                AccountDatabaseCacheDependency dep = new AccountDatabaseCacheDependency("AccountDBUpdate", state, 120);

                // Create the cache entry
                CacheHelper.Insert("AccountDBUpdate", state, dep);
            }
        }