/// <summary> Refresh the list of all user groups by pulling the data back from the database </summary>
        /// <returns> TRUE if successful, otherwise FALSE </returns>
        public static bool RefreshUserGroups()
        {
            try
            {
                lock (userGroupsLock)
                {
                    if (userGroups != null)
                    {
                        userGroups.Clear();
                    }
                    userGroups = Engine_Database.Get_All_User_Groups(null);
                }

                return(true);
            }
            catch
            {
                return(false);
            }
        }