public void UpdateOnClosing(EmpInterface employee)
        {
            if (employee == null)
            {
                return;
            }

            // Add update of first name, last name, id, username and password
            // add insert courses to teach

            Insert_DaysToTeach(employee.Get_DaysToTeach(), employee.Get_ID(), "LecturerTable");
            Insert_HoursToTeach(employee.Get_HourToTeach(), employee.Get_ID(), "LecturerTable");
            Insert_MinTimeBetweenClasses(employee.Get_MinTimeBetweenClasses(),
                                         employee.Get_ID(), "LecturerTable");
            Insert_NumOfDaysToTeach(employee.Get_NumOfDaysToTeach(), employee.Get_ID(),
                                    "LecturerTable");
            Insert_SemestersToTeach(employee.Get_SemestersToTeach(), employee.Get_ID(),
                                    "LecturerTable");
            Insert_OfficeHours(employee.Get_OfficeHoursFrom(), employee.Get_OfficeHoursTo(),
                               employee.Get_ID(), "LecturerTable");
            Insert_CoursesToTeach(employee.Get_CoursesToTeach(), employee.Get_ID(), "LecturerTable");
        }