public List <PeriodInformationWSModel> getPeriodInformation(string pPeriod, string pStudyPlan, string pBlockLevel, string pCourse, string pProfessor)
        {
            var period     = int.Parse(pPeriod);
            var blockLevel = int.Parse(pBlockLevel);
            var vStudyPlan = int.Parse(pStudyPlan);
            var vCourse    = int.Parse(pCourse);
            var vProfessor = int.Parse(pProfessor);

            return(db.SP_GetPeriodInformation(period, vStudyPlan, blockLevel, vCourse, vProfessor).ToList());
        }