public IHttpActionResult GetAuditEmp(string DepId, string empId)
        {
            if (string.IsNullOrEmpty(DepId) || string.IsNullOrEmpty(empId))
            {
                return(null);
            }
            List <Employee> list = bll.GetAuditEmp(DepId, empId).ToList();

            return(Json <List <Employee> >(list, Configuration.Formatters.JsonFormatter.SerializerSettings, Encoding.UTF8));
        }