public Boolean deleteUserGroup(string user_grp)
        {
            DBConnection_EF conn = null;

            try
            {
                conn = DBConnection_EF.GetContext();
                conn.BeginTransaction();
                userGroupDao.deleteUserGroupByID(conn, user_grp);
                userGroupDao.updateUser_ClearGroupByGroupName(conn, user_grp); //A0.03
                conn.Commit();
            }
            catch (Exception ex)
            {
                logger.Warn("Delete User Group Failed from UASUFNC [user_grp:{0}]", user_grp, ex);
                if (conn != null)
                {
                    try
                    {
                        conn.Rollback();
                    }
                    catch (Exception exception)
                    {
                        logger.Warn("Rollback Failed.", exception);
                    }
                }
                return(false);
            }
            finally
            {
                if (conn != null)
                {
                    try
                    {
                        conn.Close();
                    }
                    catch (Exception exception)
                    {
                        logger.Warn("Close Connection Failed.", exception);
                    }
                }
            }
            return(true);
        }