public virtual bool Create(YZJ_GradeModel model)
        {
            try
            {
                YZJ_Grade entity = m_Rep.GetById(model.id);
                if (entity != null)
                {
                    return(false);
                }
                entity           = new YZJ_Grade();
                entity.id        = model.id;
                entity.available = model.available;
                entity.Grade     = model.Grade;


                if (m_Rep.Create(entity))
                {
                    return(true);
                }
                else
                {
                    return(false);
                }
            }
            catch (Exception ex)
            {
                return(false);
            }
        }
        public virtual YZJ_GradeModel GetById(string id)
        {
            if (IsExists(id))
            {
                YZJ_Grade      entity = m_Rep.GetById(id);
                YZJ_GradeModel model  = new YZJ_GradeModel();
                model.id        = entity.id;
                model.available = entity.available;
                model.Grade     = entity.Grade;

                return(model);
            }
            else
            {
                return(null);
            }
        }