public string delete(int s_id = -1, int c_id = -1)
        {
            if(s_id < 0 || c_id < 0)
            {
                return false.ToJSON();
            }

            int school_id = SessionHandler.GetSchoolID();
            int user_id = SessionHandler.GetUserID();

            StudentFee sf = new StudentFee();

            sf.updated_by = user_id;
            sf.paid_status = FeePaidStatus.UNPAID;
            sf.student_id = s_id;
            sf.class_id = c_id;
            sf.school_id = school_id;
            _fsd.Delete(sf);

            return false.ToJSON();
        }
        private bool insertStudentFeeDetail(string type , int student_id, int class_id,int session_id,string month="")
        {
            StudentFee stdFee = new StudentFee();

            stdFee.paid_fee = 0;
            stdFee.paid_status = FeePaidStatus.UNPAID;
            stdFee.school_id = SessionHandler.GetSchoolID();
            stdFee.class_id = class_id;
            stdFee.updated_by = stdFee.created_by = SessionHandler.GetUserID();
            stdFee.type = type;
            stdFee.student_id = student_id;
            stdFee.fee = 0;
            stdFee.session_id = session_id;
            stdFee.month = month;

            var fees = new StudentFeeDetails();

            fees.Insert(stdFee);

            return true;
        }