Constructor and Dropdownlistbox help

Hi Guys,
I'm new to ASP.net and was wondering if anyone could provide assistance
I am trying to create a simple page with a drop down list which has 3 items. Choosing any of those 3 items calls for a specific constructor in the script.
Using VB 2008



Here is my code
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        
    }

    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (DropDownList1.Text == "Coupe")
        {
            //Response.Write("You chose the Coupe");
      & ...