public void Update(Person p)
 {
     firstnamebox.Text = p.firstname;
     lastnamebox.Text = p.lastname;
     agebox.Text = "" + p.age;
     genderbox.Text = p.gender;
     uniyearbox.Text = p.uniyear;
     phonebox.Text = p.phone;
     addressbox.Text = p.address;
     person = p;
 }
        private void button1_Click(object sender, EventArgs e)
        {
            if(person == null)
            {
                person = new Person(firstnamebox.Text, lastnamebox.Text, int.Parse(agebox.Text), genderbox.Text, uniyearbox.Text, phonebox.Text, addressbox.Text);
                Form1.AddPerson(person);
            }
            else
            {
                person.firstname = firstnamebox.Text;
                person.lastname = lastnamebox.Text;
                person.age = int.Parse(agebox.Text);
                person.gender = genderbox.Text;
                person.uniyear = uniyearbox.Text;
                person.phone = phonebox.Text;
                person.address = addressbox.Text;
            }

            Form1.savePeople();

            Close();
        }
 public static void AddPerson(Person p)
 {
     people.Add(p);
 }