public static void create_ParentFeedbak_In_DB(ParentsFeedBack pf)
        {
            SqlCommand c = new SqlCommand();

            c.CommandText = "EXECUTE dbo.SP_create_ParentFeedbak @ID, @StudentId, @DT, @Description ";
            c.Parameters.AddWithValue("@ID", pf.getId());
            c.Parameters.AddWithValue("@StudentId", pf.getCreator().getId());
            c.Parameters.AddWithValue("@DT", pf.getDateTime());
            c.Parameters.AddWithValue("@Description", pf.getDescription());
            SQL_CON SC = new SQL_CON();

            SC.execute_non_query(c);
        }
        public static void init_ParentFeedback()
        { //מילוי המערך מתוך בסיס הנתונים
            SqlCommand c = new SqlCommand();

            c.CommandText = "EXECUTE dbo.Get_All_ParentFeedback";
            SQL_CON       SC  = new SQL_CON();
            SqlDataReader rdr = SC.execute_query(c);

            parentsFeedback = new List <ParentsFeedBack>();

            while (rdr.Read())
            {
                ParentsFeedBack pf = new ParentsFeedBack(int.Parse(rdr.GetValue(0).ToString()), getStudentObject(rdr.GetValue(1).ToString()), DateTime.Parse((rdr.GetValue(2).ToString())),
                                                         rdr.GetValue(3).ToString());
                parentsFeedback.Add(pf);
                init_Grades(pf.getId());
            }
        }