C#

public partial class Form1 : Form
    {
        private static string BTMacAddress = "00:00:00:00:00:00";
        private static string Pin = "123testpin321";
        private BluetoothClient Device = new BluetoothClient();
        private static BluetoothAddress BTAddress = BluetoothAddress.Parse(BTMacAddress);
        private BluetoothEndPoint BTEndpoint = new BluetoothEndPoint(BTAddress, BluetoothService.DialupNetworking);
        public Form1()
        {
            InitializeComponent();
        }
        private void BTConnect_Click(object sender, EventArgs e)
        {
            if(!BluetoothSecurity.PairRequest(BTAddress,Pin))
                MessageBox.Show("Failed");
            else
                MessageBox.Show("Done");
        }
    }

public class Pet
{
   public string Name {get; set;}
   public int Age {get; set;}
}

public class Pets: Collection<Pet>
{ ... 

public Pet this[string name]
        {
            get { return LookupPetByName(name); }
            set
            {
                if (HavePetWithName(name))
                    throw new DublicateNameException(name);
                SetPet(name, value);
            }
        }
...}

Pets.Add(new Pet("Ares", 3);
Pets.Add(new Pet("Mike", 6);

var myPet = Pets["Ares"];
myPet.Age = 3;
myPet.Name = "Mike"; // throw DublicateNameException;