How to Use Dropdownlist Selection Day/Month/Year by ObjectDataSorce

How to Use Dropdownlist    Selection  Day/Month/Year   by ObjectDataSorce 


i would like to use  like this

http://www.serenesands.com/

i didnt  know how i use any function  to complete !!!

 but  i can select   and insert   BY  TEXT BOX  
------ this my property  ------
Public Class Customer
    Private _id As Integer = 0
    Private _custypeid As Integer = 0
    Private _custypetitle As String = ""
    Private _cusstatus As Boolean = True
    Private _cuscode As String = ""
    Private _sex As Boolean = True
    Private _firstname As String = ""
    Private _lastname As String = ""
 &nb ...