//public List<object[]> GetExpelledStudents_linq()
        //{



        //    //IEnumerable<object[]> objSorted;

        //    //if (isString == false)
        //    //{
        //    //    objSorted = obj.OrderBy(i => i[column]);
        //    //}
        //    //else
        //    //{
        //    //    objSorted = obj.OrderBy(i => i[column]);
        //    //    //todo nead to use IComparer for good string sort
        //    }

        //    List<object[]> objSort = objSorted.ToList();

        //    return new List<object[]>();
        //}



        public List <object[]> GetExpelledStudents(int SessionNumber)
        {
            //find inadmissible marks
            if (results == null)
            {
                results = resultController.Reed(out ColumnsNamesResult);
            }

            List <Result> ModifyResults = new List <Result>();

            foreach (Result r in results)
            {
                if (r.Mark < 4 || r.Mark == null)
                {
                    ModifyResults.Add(r);
                }
            }

            //find right session
            List <Schedule> schedules = GetSession(SessionNumber, ModifyResults);

            List <Result> ModyfiModifyResults = ModyfyResults(ModifyResults, schedules);

            ModifyResults.Clear();

            //find expelleds student
            List <Student> Expelledstudents = new List <Student>();

            foreach (Result r in ModyfiModifyResults)
            {
                Expelledstudents.Add(studentController.Reed(r.StudentsID));
            }

            //delete dublicate
            List <Student> ExpelledstudentsMod = Expelledstudents.Distinct().ToList <Student>();

            //find name team
            List <Team> teams = new List <Team>();

            foreach (Student s in ExpelledstudentsMod)
            {
                teams.Add(teamController.Reed(s.TeamID));
            }

            List <object[]> objs = new List <object[]>();

            objs.Add(new object[] { "Team", "ExpelledStudents" });

            for (int i = 0; i < ExpelledstudentsMod.Count; i++)
            {
                objs.Add(new object[] { teams[i].Name, ExpelledstudentsMod[i].Name });
            }

            return(objs);
        }