public Student UpdateStudent(string id, Student s)
{
Student p = objStudent.FirstOrDefault(e => e.ID.Equals(id));
p.birthdate = s.birthdate;
p.firstname = s.firstname;
p.lastname = s.lastname;
p.idbooster = s.idbooster;
return p;
}
public Student CreateStudent(Student s)
{
s.ID = (++studentCount).ToString();
objStudent.Add(s);
return s;
}