public DataTable GetCustomers(bool BypassCache) 
{ 
string cacheKey = "CustomersDataTable"; object cacheItem = Cache[cacheKey] as DataTable; if((BypassCache) || (cacheItem == null)) 
{ cacheItem = GetCustomersFromDataSource(); Cache.Insert(cacheKey, cacheItem, null, DateTime.Now.AddSeconds(GetCacheSecondsFromConfig(cacheKey), TimeSpan.Zero); 
} return (DataTable)cacheItem; 
}