C#

public class Person
{
  string name, DateTime birthday;
  public string Name
  {
    get { return name; }
    set { if (value == null) throw new ArgumentNullException(); name = value; }
  }
  public DateTime Birthday
  {
    get { return birthday; }
    set { birthday = value; }
  }
}

public class pair<T1, T2>
{
    public T1 First
    {
        get {return this.t1;}
        set {this.t1 = value;}
    }

    public T2 Second
    {
        get { return this.t2; }
        set { this.t2 = value; }
    }

    public pair(T1 type1, T2 type2)
    {
        this.t1 = type1;
        this.t2 = type2;
    }
    private T1 t1;
    private T2 t2;
}
/// Implementation
private void button1_Click(object sender, EventArgs e)
{
    pair<int, int> i = new pair<int, int>(5, 10);
    MessageBox.Show(string.Format("First value:{0}, second value:{1}",
        i.First.ToString(), i.Second.ToString()));
}

<?xml version="1.0">
<?mso-application progid="Word.Document"?>