private void ExpiringDictionaryTimer()
 {
     while (isRunning())
     {
         Thread.Sleep(3000);
         System.Diagnostics.Debug.WriteLine("FGS ServerAPI @ GC started.");
         try
         {
             foreach (var pair in SessionObjects.DUserTables.Keys.ToList())
             {
                 if (pair != Utils.SERVER_NAME + "_fillUsersToCache")
                 {
                     ExpiringDictionary <string, object> _DictionaryTable = ((UserInformation)SessionObjects.wincache_ucache_get(pair)).OnlineClients;
                     if (!isRunning())
                     {
                         foreach (var onlineuserpair in _DictionaryTable.Keys.ToList())
                         {
                             _DictionaryTable.DestoryExpiredItems(onlineuserpair);
                         }
                     }
                 }
             }
         }
         finally
         {
             System.Diagnostics.Debug.WriteLine("FGS ServerAPI @ GC finished.");
         }
     }
 }