private void button1_Click(object sender, EventArgs e)
        {
            int age;
            int weight;
            if (!int.TryParse(textBox2.Text, out age) || !int.TryParse(textBox4.Text, out weight))
            {
                MessageBox.Show("Leeftijd en Gewicht moeten numeriek zijn.");
            }
            else
            {
                bool gender;
                if (comboBox1.SelectedText == "Man")
                {
                    gender = true;
                }
                else
                {
                    gender = false;
                }

                User user = new User(textBox1.Text, passBox.Text, age, gender,
                    weight, false);
                connection.SendNewPatient(user);
                this.Visible = false;
            }
        }
 public static string GetUserSessions(User patient)
 {
     return JsonConvert.SerializeObject(patient.GetSessions());
 }
 public static string GetUser(User u)
 {
     return JsonConvert.SerializeObject(u);
 }
	public static void SaveUser(User u)
        {
            File.WriteAllText(@"JSON Files\" + u.id + ".json", GetUser(u));
        }
	public static string SerializeUser(User user)
        {
            return JsonConvert.SerializeObject(user);
        }
 public void SendNewPatient(User user)
 {
     // send command ( cmdID | username )
     SendString("4|" + user.id + "|" + user.password + "|" + user.age + "|" + user.gender + "|" + user.weight + "|");
 }