//private void addStaffDetailsGroupBox_Enter(object sender, EventArgs e)
        //{
        //    if (studentRadioButton.Checked)
        //    {
        //        staff = 1;
        //        studentDetailsGroupBox.Visible = true;
        //    }
        //    else if (LecturerRadioButton.Checked)
        //    {
        //        staff = 2;
        //        studentDetailsGroupBox.Visible = false;
        //    }

        //}

        private void AddStaffFormAddButton_Click(object sender, EventArgs e)
        {
            //MessageWarning();

            //foreach (string element in staffDetailsList)
            //{
            //    if (element == "" || element == "middleName)
            //        MessageBox.Show("Please complete the form!");
            //}
            if (id == null)
            {
                MessageWarning("ID");
            }
            else if (firstName == null)
            {
                MessageWarning("first name");
            }
            else if (middleName == null)
            {
                MessageWarning("middle name");
            }
            else if (lastName == null)
            {
                MessageWarning("last name");
            }
            //else if (department_1 == "None" && department_2 == "None")
            //    MessageWarning("department");
            else if (studentRadioButton.Checked)
            {
                Student newStudent = new Student();

                newStudent.Id         = int.Parse(id);
                newStudent.FirstName  = firstName;
                newStudent.MiddleName = middleName;
                newStudent.LastName   = lastName;
                //newStudent.Department_1 = department_1;
                //newStudent.Department_2 = department_2;
                newStudent.Degree = degree;
                newStudent.Grade  = grade;
                newStudent.Term   = term;
                //newStudent.Major = major;
                if (!newStudent.uniqueIDChecking(int.Parse(id)))
                {
                    MessageBox.Show("The student ID: " + id + " is exist.");
                }
                else
                {
                    SystemList.StudentList.Add(newStudent);
                    SavingAndReading data = new SavingAndReading();
                    data.WriteStudentFile();
                }
            }
            else if (LecturerRadioButton.Checked)
            {
                Lecturer newLecturer = new Lecturer();
                newLecturer.Id         = int.Parse(id);
                newLecturer.FirstName  = firstName;
                newLecturer.MiddleName = middleName;
                newLecturer.LastName   = lastName;

                if (!newLecturer.uniqueIDChecking(int.Parse(id)))
                {
                    MessageBox.Show("The lecturer ID: " + id + " is exist.");
                }
                else
                {
                    SystemList.LecturerList.Add(newLecturer);
                    SavingAndReading data = new SavingAndReading();
                    data.WriteLecturerFile();
                }
            }
        }