public enum CacheKey    {        LanguageQueryProcess_FetchAll,        ProjectQueryProcess_FetchAll    }    public class SystemCache    {        /// <summary>        /// HttpContext.Current.Cache.Insert(string key, object value, CacheDependency dependencies, DateTime absoluteExpiration, TimeSpan slidingExpiration)        /// Set cache        ///         /// default 20 minutes        /// </summary>        /// <param name="key"></param>        /// <param name="value"></param>        public static void SetCache(CacheKey key, object value, int expirationMinutes = 20)        {            DateTime expirationTime = DateTime.Now.AddMinutes(expirationMinutes);            HttpContext.Current.Cache.Insert(                key.ToString()                , value                , null                , expirationTime                , TimeSpan.Zero                );        }        /// <summary>        /// get cache        /// </summary>        /// <param name="key"></param>        /// <returns></returns>        public static object GetCache(CacheKey key)        {            object value = http://www.mamicode.com/HttpContext.Current.Cache.Get(key.ToString());>