private void AddNewStudent(Student newStudent)
{
foreach (Student student in this.students)
{
if (newStudent.ClassNumber == student.ClassNumber)
{
throw new InvalidOperationException("There's already a student with this class number in the class!");
}
}
this.students.Add(newStudent);
}
public void RemoveStudent(Student student)
{
this.students.Remove(student);
}
public void AddStudent(Student newStudent)
{
AddNewStudent(newStudent);
}