Try this way
List<Person> person = new List<Person>()
{
new Person(){Name="Anna", Birthday=new DateTime(2006, 10, 01), Age=12},
new Person(){Name="Ben", Birthday=new DateTime(2006, 11, 02), Age=13},
new Person(){Name="Cora", Birthday=new DateTime(2006, 01, 03), Age=11},
new Person(){Name="Dan", Birthday=new DateTime(2006, 02, 04), Age=11},
new Person(){Name="Eve", Birthday=new DateTime(2006, 12, 20), Age=14},
new Person(){Name="Fe", Birthday=new DateTime(2006, 12, 05), Age=15},
new Person(){Name="George", Birthday=new DateTime(2006, 12, 06), Age=12},
new Person(){Name="Helen", Birthday=new DateTime(2006, 12, 30), Age=13},
new Person(){Name="Ivan", Birthday=new DateTime(2006, 12, 30), Age=15},
};
comboBox1.DataSource = person;
comboBox1.DisplayMember = "Name";
Post this code in your Form Load event.
Hope this helps